creation_sourcecode: // File: @openzeppelin/contracts/cryptography/MerkleProof.sol
  
  
  
  pragma solidity 0.8.25;
  
  /**
   * @dev These functions deal with verification of Merkle trees (hash trees),
   */
  library MerkleProof {
      /**
       * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
       * defined by `root`. For this, a `proof` must be provided, containing
       * sibling hashes on the branch from the leaf to the root of the tree. Each
       * pair of leaves and each pair of pre-images are assumed to be sorted.
       */
      function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
          bytes32 computedHash = leaf;
  
          for (uint256 i = 0; i < proof.length; i++) {
              bytes32 proofElement = proof[i];
  
              if (computedHash <= proofElement) {
                  // Hash(current computed hash + current element of the proof)
                  computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
              } else {
                  // Hash(current element of the proof + current computed hash)
                  computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
              }
          }
  
          // Check if the computed hash (root) is equal to the provided root
          return computedHash == root;
      }
  }
  
  // File: @openzeppelin/contracts/utils/math/SignedMath.sol
  
  
  // OpenZeppelin Contracts (last updated v5.0.0) (utils/math/SignedMath.sol)
  
  pragma solidity ^0.8.20;
  
  /**
   * @dev Standard signed math utilities missing in the Solidity language.
   */
  library SignedMath {
      /**
       * @dev Returns the largest of two signed numbers.
       */
      function max(int256 a, int256 b) internal pure returns (int256) {
          return a > b ? a : b;
      }
  
      /**
       * @dev Returns the smallest of two signed numbers.
       */
      function min(int256 a, int256 b) internal pure returns (int256) {
          return a < b ? a : b;
      }
  
      /**
       * @dev Returns the average of two signed numbers without overflow.
       * The result is rounded towards zero.
       */
      function average(int256 a, int256 b) internal pure returns (int256) {
          // Formula from the book "Hacker's Delight"
          int256 x = (a & b) + ((a ^ b) >> 1);
          return x + (int256(uint256(x) >> 255) & (a ^ b));
      }
  
      /**
       * @dev Returns the absolute unsigned value of a signed value.
       */
      function abs(int256 n) internal pure returns (uint256) {
          unchecked {
              // must be unchecked in order to support `n = type(int256).min`
              return uint256(n >= 0 ? n : -n);
          }
      }
  }
  
  // File: @openzeppelin/contracts/utils/math/Math.sol
  
  
  // OpenZeppelin Contracts (last updated v5.0.0) (utils/math/Math.sol)
  
  pragma solidity ^0.8.20;
  
  /**
   * @dev Standard math utilities missing in the Solidity language.
   */
  library Math {
      /**
       * @dev Muldiv operation overflow.
       */
      error MathOverflowedMulDiv();
  
      enum Rounding {
          Floor, // Toward negative infinity
          Ceil, // Toward positive infinity
          Trunc, // Toward zero
          Expand // Away from zero
      }
  
      /**
       * @dev Returns the addition of two unsigned integers, with an overflow flag.
       */
      function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
          unchecked {
              uint256 c = a + b;
              if (c < a) return (false, 0);
              return (true, c);
          }
      }
  
      /**
       * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
       */
      function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
          unchecked {
              if (b > a) return (false, 0);
              return (true, a - b);
          }
      }
  
      /**
       * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
       */
      function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
          unchecked {
              // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
              // benefit is lost if 'b' is also tested.
              // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
              if (a == 0) return (true, 0);
              uint256 c = a * b;
              if (c / a != b) return (false, 0);
              return (true, c);
          }
      }
  
      /**
       * @dev Returns the division of two unsigned integers, with a division by zero flag.
       */
      function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
          unchecked {
              if (b == 0) return (false, 0);
              return (true, a / b);
          }
      }
  
      /**
       * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
       */
      function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
          unchecked {
              if (b == 0) return (false, 0);
              return (true, a % b);
          }
      }
  
      /**
       * @dev Returns the largest of two numbers.
       */
      function max(uint256 a, uint256 b) internal pure returns (uint256) {
          return a > b ? a : b;
      }
  
      /**
       * @dev Returns the smallest of two numbers.
       */
      function min(uint256 a, uint256 b) internal pure returns (uint256) {
          return a < b ? a : b;
      }
  
      /**
       * @dev Returns the average of two numbers. The result is rounded towards
       * zero.
       */
      function average(uint256 a, uint256 b) internal pure returns (uint256) {
          // (a + b) / 2 can overflow.
          return (a & b) + (a ^ b) / 2;
      }
  
      /**
       * @dev Returns the ceiling of the division of two numbers.
       *
       * This differs from standard division with `/` in that it rounds towards infinity instead
       * of rounding towards zero.
       */
      function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
          if (b == 0) {
              // Guarantee the same behavior as in a regular Solidity division.
              return a / b;
          }
  
          // (a + b - 1) / b can overflow on addition, so we distribute.
          return a == 0 ? 0 : (a - 1) / b + 1;
      }
  
      /**
       * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or
       * denominator == 0.
       * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) with further edits by
       * Uniswap Labs also under MIT license.
       */
      function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
          unchecked {
              // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
              // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
              // variables such that product = prod1 * 2^256 + prod0.
              uint256 prod0 = x * y; // Least significant 256 bits of the product
              uint256 prod1; // Most significant 256 bits of the product
              assembly {
                  let mm := mulmod(x, y, not(0))
                  prod1 := sub(sub(mm, prod0), lt(mm, prod0))
              }
  
              // Handle non-overflow cases, 256 by 256 division.
              if (prod1 == 0) {
                  // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                  // The surrounding unchecked block does not change this fact.
                  // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                  return prod0 / denominator;
              }
  
              // Make sure the result is less than 2^256. Also prevents denominator == 0.
              if (denominator <= prod1) {
                  revert MathOverflowedMulDiv();
              }
  
              ///////////////////////////////////////////////
              // 512 by 256 division.
              ///////////////////////////////////////////////
  
              // Make division exact by subtracting the remainder from [prod1 prod0].
              uint256 remainder;
              assembly {
                  // Compute remainder using mulmod.
                  remainder := mulmod(x, y, denominator)
  
                  // Subtract 256 bit number from 512 bit number.
                  prod1 := sub(prod1, gt(remainder, prod0))
                  prod0 := sub(prod0, remainder)
              }
  
              // Factor powers of two out of denominator and compute largest power of two divisor of denominator.
              // Always >= 1. See https://cs.stackexchange.com/q/138556/92363.
  
              uint256 twos = denominator & (0 - denominator);
              assembly {
                  // Divide denominator by twos.
                  denominator := div(denominator, twos)
  
                  // Divide [prod1 prod0] by twos.
                  prod0 := div(prod0, twos)
  
                  // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                  twos := add(div(sub(0, twos), twos), 1)
              }
  
              // Shift in bits from prod1 into prod0.
              prod0 |= prod1 * twos;
  
              // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
              // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
              // four bits. That is, denominator * inv = 1 mod 2^4.
              uint256 inverse = (3 * denominator) ^ 2;
  
              // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also
              // works in modular arithmetic, doubling the correct bits in each step.
              inverse *= 2 - denominator * inverse; // inverse mod 2^8
              inverse *= 2 - denominator * inverse; // inverse mod 2^16
              inverse *= 2 - denominator * inverse; // inverse mod 2^32
              inverse *= 2 - denominator * inverse; // inverse mod 2^64
              inverse *= 2 - denominator * inverse; // inverse mod 2^128
              inverse *= 2 - denominator * inverse; // inverse mod 2^256
  
              // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
              // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
              // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
              // is no longer required.
              result = prod0 * inverse;
              return result;
          }
      }
  
      /**
       * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
       */
      function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
          uint256 result = mulDiv(x, y, denominator);
          if (unsignedRoundsUp(rounding) && mulmod(x, y, denominator) > 0) {
              result += 1;
          }
          return result;
      }
  
      /**
       * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded
       * towards zero.
       *
       * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
       */
      function sqrt(uint256 a) internal pure returns (uint256) {
          if (a == 0) {
              return 0;
          }
  
          // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
          //
          // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
          // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
          //
          // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
          // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
          // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
          //
          // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
          uint256 result = 1 << (log2(a) >> 1);
  
          // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
          // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
          // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
          // into the expected uint128 result.
          unchecked {
              result = (result + a / result) >> 1;
              result = (result + a / result) >> 1;
              result = (result + a / result) >> 1;
              result = (result + a / result) >> 1;
              result = (result + a / result) >> 1;
              result = (result + a / result) >> 1;
              result = (result + a / result) >> 1;
              return min(result, a / result);
          }
      }
  
      /**
       * @notice Calculates sqrt(a), following the selected rounding direction.
       */
      function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
          unchecked {
              uint256 result = sqrt(a);
              return result + (unsignedRoundsUp(rounding) && result * result < a ? 1 : 0);
          }
      }
  
      /**
       * @dev Return the log in base 2 of a positive value rounded towards zero.
       * Returns 0 if given 0.
       */
      function log2(uint256 value) internal pure returns (uint256) {
          uint256 result = 0;
          unchecked {
              if (value >> 128 > 0) {
                  value >>= 128;
                  result += 128;
              }
              if (value >> 64 > 0) {
                  value >>= 64;
                  result += 64;
              }
              if (value >> 32 > 0) {
                  value >>= 32;
                  result += 32;
              }
              if (value >> 16 > 0) {
                  value >>= 16;
                  result += 16;
              }
              if (value >> 8 > 0) {
                  value >>= 8;
                  result += 8;
              }
              if (value >> 4 > 0) {
                  value >>= 4;
                  result += 4;
              }
              if (value >> 2 > 0) {
                  value >>= 2;
                  result += 2;
              }
              if (value >> 1 > 0) {
                  result += 1;
              }
          }
          return result;
      }
  
      /**
       * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
       * Returns 0 if given 0.
       */
      function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
          unchecked {
              uint256 result = log2(value);
              return result + (unsignedRoundsUp(rounding) && 1 << result < value ? 1 : 0);
          }
      }
  
      /**
       * @dev Return the log in base 10 of a positive value rounded towards zero.
       * Returns 0 if given 0.
       */
      function log10(uint256 value) internal pure returns (uint256) {
          uint256 result = 0;
          unchecked {
              if (value >= 10 ** 64) {
                  value /= 10 ** 64;
                  result += 64;
              }
              if (value >= 10 ** 32) {
                  value /= 10 ** 32;
                  result += 32;
              }
              if (value >= 10 ** 16) {
                  value /= 10 ** 16;
                  result += 16;
              }
              if (value >= 10 ** 8) {
                  value /= 10 ** 8;
                  result += 8;
              }
              if (value >= 10 ** 4) {
                  value /= 10 ** 4;
                  result += 4;
              }
              if (value >= 10 ** 2) {
                  value /= 10 ** 2;
                  result += 2;
              }
              if (value >= 10 ** 1) {
                  result += 1;
              }
          }
          return result;
      }
  
      /**
       * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
       * Returns 0 if given 0.
       */
      function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
          unchecked {
              uint256 result = log10(value);
              return result + (unsignedRoundsUp(rounding) && 10 ** result < value ? 1 : 0);
          }
      }
  
      /**
       * @dev Return the log in base 256 of a positive value rounded towards zero.
       * Returns 0 if given 0.
       *
       * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
       */
      function log256(uint256 value) internal pure returns (uint256) {
          uint256 result = 0;
          unchecked {
              if (value >> 128 > 0) {
                  value >>= 128;
                  result += 16;
              }
              if (value >> 64 > 0) {
                  value >>= 64;
                  result += 8;
              }
              if (value >> 32 > 0) {
                  value >>= 32;
                  result += 4;
              }
              if (value >> 16 > 0) {
                  value >>= 16;
                  result += 2;
              }
              if (value >> 8 > 0) {
                  result += 1;
              }
          }
          return result;
      }
  
      /**
       * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
       * Returns 0 if given 0.
       */
      function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
          unchecked {
              uint256 result = log256(value);
              return result + (unsignedRoundsUp(rounding) && 1 << (result << 3) < value ? 1 : 0);
          }
      }
  
      /**
       * @dev Returns whether a provided rounding mode is considered rounding up for unsigned integers.
       */
      function unsignedRoundsUp(Rounding rounding) internal pure returns (bool) {
          return uint8(rounding) % 2 == 1;
      }
  }
  
  // File: @openzeppelin/contracts/utils/Strings.sol
  
  
  // OpenZeppelin Contracts (last updated v5.0.0) (utils/Strings.sol)
  
  pragma solidity ^0.8.20;
  
  
  
  /**
   * @dev String operations.
   */
  library Strings {
      bytes16 private constant HEX_DIGITS = "0123456789abcdef";
      uint8 private constant ADDRESS_LENGTH = 20;
  
      /**
       * @dev The `value` string doesn't fit in the specified `length`.
       */
      error StringsInsufficientHexLength(uint256 value, uint256 length);
  
      /**
       * @dev Converts a `uint256` to its ASCII `string` decimal representation.
       */
      function toString(uint256 value) internal pure returns (string memory) {
          unchecked {
              uint256 length = Math.log10(value) + 1;
              string memory buffer = new string(length);
              uint256 ptr;
              /// @solidity memory-safe-assembly
              assembly {
                  ptr := add(buffer, add(32, length))
              }
              while (true) {
                  ptr--;
                  /// @solidity memory-safe-assembly
                  assembly {
                      mstore8(ptr, byte(mod(value, 10), HEX_DIGITS))
                  }
                  value /= 10;
                  if (value == 0) break;
              }
              return buffer;
          }
      }
  
      /**
       * @dev Converts a `int256` to its ASCII `string` decimal representation.
       */
      function toStringSigned(int256 value) internal pure returns (string memory) {
          return string.concat(value < 0 ? "-" : "", toString(SignedMath.abs(value)));
      }
  
      /**
       * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
       */
      function toHexString(uint256 value) internal pure returns (string memory) {
          unchecked {
              return toHexString(value, Math.log256(value) + 1);
          }
      }
  
      /**
       * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
       */
      function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
          uint256 localValue = value;
          bytes memory buffer = new bytes(2 * length + 2);
          buffer[0] = "0";
          buffer[1] = "x";
          for (uint256 i = 2 * length + 1; i > 1; --i) {
              buffer[i] = HEX_DIGITS[localValue & 0xf];
              localValue >>= 4;
          }
          if (localValue != 0) {
              revert StringsInsufficientHexLength(value, length);
          }
          return string(buffer);
      }
  
      /**
       * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal
       * representation.
       */
      function toHexString(address addr) internal pure returns (string memory) {
          return toHexString(uint256(uint160(addr)), ADDRESS_LENGTH);
      }
  
      /**
       * @dev Returns true if the two strings are equal.
       */
      function equal(string memory a, string memory b) internal pure returns (bool) {
          return bytes(a).length == bytes(b).length && keccak256(bytes(a)) == keccak256(bytes(b));
      }
  }
  
  // File: @openzeppelin/contracts/utils/cryptography/ECDSA.sol
  
  
  // OpenZeppelin Contracts (last updated v5.0.0) (utils/cryptography/ECDSA.sol)
  
  pragma solidity ^0.8.20;
  
  /**
   * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
   *
   * These functions can be used to verify that a message was signed by the holder
   * of the private keys of a given address.
   */
  library ECDSA {
      enum RecoverError {
          NoError,
          InvalidSignature,
          InvalidSignatureLength,
          InvalidSignatureS
      }
  
      /**
       * @dev The signature derives the `address(0)`.
       */
      error ECDSAInvalidSignature();
  
      /**
       * @dev The signature has an invalid length.
       */
      error ECDSAInvalidSignatureLength(uint256 length);
  
      /**
       * @dev The signature has an S value that is in the upper half order.
       */
      error ECDSAInvalidSignatureS(bytes32 s);
  
      /**
       * @dev Returns the address that signed a hashed message (`hash`) with `signature` or an error. This will not
       * return address(0) without also returning an error description. Errors are documented using an enum (error type)
       * and a bytes32 providing additional information about the error.
       *
       * If no error is returned, then the address can be used for verification purposes.
       *
       * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
       * this function rejects them by requiring the `s` value to be in the lower
       * half order, and the `v` value to be either 27 or 28.
       *
       * IMPORTANT: `hash` _must_ be the result of a hash operation for the
       * verification to be secure: it is possible to craft signatures that
       * recover to arbitrary addresses for non-hashed data. A safe way to ensure
       * this is by receiving a hash of the original message (which may otherwise
       * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
       *
       * Documentation for signature generation:
       * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
       * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
       */
      function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError, bytes32) {
          if (signature.length == 65) {
              bytes32 r;
              bytes32 s;
              uint8 v;
              // ecrecover takes the signature parameters, and the only way to get them
              // currently is to use assembly.
              /// @solidity memory-safe-assembly
              assembly {
                  r := mload(add(signature, 0x20))
                  s := mload(add(signature, 0x40))
                  v := byte(0, mload(add(signature, 0x60)))
              }
              return tryRecover(hash, v, r, s);
          } else {
              return (address(0), RecoverError.InvalidSignatureLength, bytes32(signature.length));
          }
      }
  
      /**
       * @dev Returns the address that signed a hashed message (`hash`) with
       * `signature`. This address can then be used for verification purposes.
       *
       * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
       * this function rejects them by requiring the `s` value to be in the lower
       * half order, and the `v` value to be either 27 or 28.
       *
       * IMPORTANT: `hash` _must_ be the result of a hash operation for the
       * verification to be secure: it is possible to craft signatures that
       * recover to arbitrary addresses for non-hashed data. A safe way to ensure
       * this is by receiving a hash of the original message (which may otherwise
       * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
       */
      function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
          (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, signature);
          _throwError(error, errorArg);
          return recovered;
      }
  
      /**
       * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
       *
       * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
       */
      function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError, bytes32) {
          unchecked {
              bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
              // We do not check for an overflow here since the shift operation results in 0 or 1.
              uint8 v = uint8((uint256(vs) >> 255) + 27);
              return tryRecover(hash, v, r, s);
          }
      }
  
      /**
       * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
       */
      function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
          (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, r, vs);
          _throwError(error, errorArg);
          return recovered;
      }
  
      /**
       * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
       * `r` and `s` signature fields separately.
       */
      function tryRecover(
          bytes32 hash,
          uint8 v,
          bytes32 r,
          bytes32 s
      ) internal pure returns (address, RecoverError, bytes32) {
          // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
          // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
          // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
          // signatures from current libraries generate a unique signature with an s-value in the lower half order.
          //
          // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
          // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
          // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
          // these malleable signatures as well.
          if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
              return (address(0), RecoverError.InvalidSignatureS, s);
          }
  
          // If the signature is valid (and not malleable), return the signer address
          address signer = ecrecover(hash, v, r, s);
          if (signer == address(0)) {
              return (address(0), RecoverError.InvalidSignature, bytes32(0));
          }
  
          return (signer, RecoverError.NoError, bytes32(0));
      }
  
      /**
       * @dev Overload of {ECDSA-recover} that receives the `v`,
       * `r` and `s` signature fields separately.
       */
      function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
          (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, v, r, s);
          _throwError(error, errorArg);
          return recovered;
      }
  
      /**
       * @dev Optionally reverts with the corresponding custom error according to the `error` argument provided.
       */
      function _throwError(RecoverError error, bytes32 errorArg) private pure {
          if (error == RecoverError.NoError) {
              return; // no error: do nothing
          } else if (error == RecoverError.InvalidSignature) {
              revert ECDSAInvalidSignature();
          } else if (error == RecoverError.InvalidSignatureLength) {
              revert ECDSAInvalidSignatureLength(uint256(errorArg));
          } else if (error == RecoverError.InvalidSignatureS) {
              revert ECDSAInvalidSignatureS(errorArg);
          }
      }
  }
  
  // File: @openzeppelin/contracts/utils/introspection/IERC165.sol
  
  
  // OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/IERC165.sol)
  
  pragma solidity ^0.8.20;
  
  /**
   * @dev Interface of the ERC165 standard, as defined in the
   * https://eips.ethereum.org/EIPS/eip-165[EIP].
   *
   * Implementers can declare support of contract interfaces, which can then be
   * queried by others ({ERC165Checker}).
   *
   * For an implementation, see {ERC165}.
   */
  interface IERC165 {
      /**
       * @dev Returns true if this contract implements the interface defined by
       * `interfaceId`. See the corresponding
       * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
       * to learn more about how these ids are created.
       *
       * This function call must use less than 30 000 gas.
       */
      function supportsInterface(bytes4 interfaceId) external view returns (bool);
  }
  
  // File: @openzeppelin/contracts/utils/introspection/ERC165.sol
  
  
  // OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/ERC165.sol)
  
  pragma solidity ^0.8.20;
  
  
  /**
   * @dev Implementation of the {IERC165} interface.
   *
   * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
   * for the additional interface id that will be supported. For example:
   *
   * ```solidity
   * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
   *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
   * }
   * ```
   */
  abstract contract ERC165 is IERC165 {
      /**
       * @dev See {IERC165-supportsInterface}.
       */
      function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
          return interfaceId == type(IERC165).interfaceId;
      }
  }
  
  // File: @openzeppelin/contracts/interfaces/IERC2981.sol
  
  
  // OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC2981.sol)
  
  pragma solidity ^0.8.20;
  
  
  /**
   * @dev Interface for the NFT Royalty Standard.
   *
   * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal
   * support for royalty payments across all NFT marketplaces and ecosystem participants.
   */
  interface IERC2981 is IERC165 {
      /**
       * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of
       * exchange. The royalty amount is denominated and should be paid in that same unit of exchange.
       */
      function royaltyInfo(
          uint256 tokenId,
          uint256 salePrice
      ) external view returns (address receiver, uint256 royaltyAmount);
  }
  
  // File: @openzeppelin/contracts/token/common/ERC2981.sol
  
  
  // OpenZeppelin Contracts (last updated v5.0.0) (token/common/ERC2981.sol)
  
  pragma solidity ^0.8.20;
  
  
  
  /**
   * @dev Implementation of the NFT Royalty Standard, a standardized way to retrieve royalty payment information.
   *
   * Royalty information can be specified globally for all token ids via {_setDefaultRoyalty}, and/or individually for
   * specific token ids via {_setTokenRoyalty}. The latter takes precedence over the first.
   *
   * Royalty is specified as a fraction of sale price. {_feeDenominator} is overridable but defaults to 10000, meaning the
   * fee is specified in basis points by default.
   *
   * IMPORTANT: ERC-2981 only specifies a way to signal royalty information and does not enforce its payment. See
   * https://eips.ethereum.org/EIPS/eip-2981#optional-royalty-payments[Rationale] in the EIP. Marketplaces are expected to
   * voluntarily pay royalties together with sales, but note that this standard is not yet widely supported.
   */
  abstract contract ERC2981 is IERC2981, ERC165 {
      struct RoyaltyInfo {
          address receiver;
          uint96 royaltyFraction;
      }
  
      RoyaltyInfo private _defaultRoyaltyInfo;
      mapping(uint256 tokenId => RoyaltyInfo) private _tokenRoyaltyInfo;
  
      /**
       * @dev The default royalty set is invalid (eg. (numerator / denominator) >= 1).
       */
      error ERC2981InvalidDefaultRoyalty(uint256 numerator, uint256 denominator);
  
      /**
       * @dev The default royalty receiver is invalid.
       */
      error ERC2981InvalidDefaultRoyaltyReceiver(address receiver);
  
      /**
       * @dev The royalty set for an specific `tokenId` is invalid (eg. (numerator / denominator) >= 1).
       */
      error ERC2981InvalidTokenRoyalty(uint256 tokenId, uint256 numerator, uint256 denominator);
  
      /**
       * @dev The royalty receiver for `tokenId` is invalid.
       */
      error ERC2981InvalidTokenRoyaltyReceiver(uint256 tokenId, address receiver);
  
      /**
       * @dev See {IERC165-supportsInterface}.
       */
      function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC165) returns (bool) {
          return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId);
      }
  
      /**
       * @inheritdoc IERC2981
       */
      function royaltyInfo(uint256 tokenId, uint256 salePrice) public view virtual returns (address, uint256) {
          RoyaltyInfo memory royalty = _tokenRoyaltyInfo[tokenId];
  
          if (royalty.receiver == address(0)) {
              royalty = _defaultRoyaltyInfo;
          }
  
          uint256 royaltyAmount = (salePrice * royalty.royaltyFraction) / _feeDenominator();
  
          return (royalty.receiver, royaltyAmount);
      }
  
      /**
       * @dev The denominator with which to interpret the fee set in {_setTokenRoyalty} and {_setDefaultRoyalty} as a
       * fraction of the sale price. Defaults to 10000 so fees are expressed in basis points, but may be customized by an
       * override.
       */
      function _feeDenominator() internal pure virtual returns (uint96) {
          return 10000;
      }
  
      /**
       * @dev Sets the royalty information that all ids in this contract will default to.
       *
       * Requirements:
       *
       * - `receiver` cannot be the zero address.
       * - `feeNumerator` cannot be greater than the fee denominator.
       */
      function _setDefaultRoyalty(address receiver, uint96 feeNumerator) internal virtual {
          uint256 denominator = _feeDenominator();
          if (feeNumerator > denominator) {
              // Royalty fee will exceed the sale price
              revert ERC2981InvalidDefaultRoyalty(feeNumerator, denominator);
          }
          if (receiver == address(0)) {
              revert ERC2981InvalidDefaultRoyaltyReceiver(address(0));
          }
  
          _defaultRoyaltyInfo = RoyaltyInfo(receiver, feeNumerator);
      }
  
      /**
       * @dev Removes default royalty information.
       */
      function _deleteDefaultRoyalty() internal virtual {
          delete _defaultRoyaltyInfo;
      }
  
      /**
       * @dev Sets the royalty information for a specific token id, overriding the global default.
       *
       * Requirements:
       *
       * - `receiver` cannot be the zero address.
       * - `feeNumerator` cannot be greater than the fee denominator.
       */
      function _setTokenRoyalty(uint256 tokenId, address receiver, uint96 feeNumerator) internal virtual {
          uint256 denominator = _feeDenominator();
          if (feeNumerator > denominator) {
              // Royalty fee will exceed the sale price
              revert ERC2981InvalidTokenRoyalty(tokenId, feeNumerator, denominator);
          }
          if (receiver == address(0)) {
              revert ERC2981InvalidTokenRoyaltyReceiver(tokenId, address(0));
          }
  
          _tokenRoyaltyInfo[tokenId] = RoyaltyInfo(receiver, feeNumerator);
      }
  
      /**
       * @dev Resets royalty information for the token id back to the global default.
       */
      function _resetTokenRoyalty(uint256 tokenId) internal virtual {
          delete _tokenRoyaltyInfo[tokenId];
      }
  }
  
  // File: @openzeppelin/contracts/utils/Context.sol
  
  
  // OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)
  
  pragma solidity ^0.8.20;
  
  /**
   * @dev Provides information about the current execution context, including the
   * sender of the transaction and its data. While these are generally available
   * via msg.sender and msg.data, they should not be accessed in such a direct
   * manner, since when dealing with meta-transactions the account sending and
   * paying for execution may not be the actual sender (as far as an application
   * is concerned).
   *
   * This contract is only required for intermediate, library-like contracts.
   */
  abstract contract Context {
      function _msgSender() internal view virtual returns (address) {
          return msg.sender;
      }
  
      function _msgData() internal view virtual returns (bytes calldata) {
          return msg.data;
      }
  
      function _contextSuffixLength() internal view virtual returns (uint256) {
          return 0;
      }
  }
  
  // File: @openzeppelin/contracts/access/Ownable.sol
  
  
  // OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)
  
  pragma solidity ^0.8.20;
  
  
  /**
   * @dev Contract module which provides a basic access control mechanism, where
   * there is an account (an owner) that can be granted exclusive access to
   * specific functions.
   *
   * The initial owner is set to the address provided by the deployer. This can
   * later be changed with {transferOwnership}.
   *
   * This module is used through inheritance. It will make available the modifier
   * `onlyOwner`, which can be applied to your functions to restrict their use to
   * the owner.
   */
  abstract contract Ownable is Context {
      address private _owner;
  
      /**
       * @dev The caller account is not authorized to perform an operation.
       */
      error OwnableUnauthorizedAccount(address account);
  
      /**
       * @dev The owner is not a valid owner account. (eg. `address(0)`)
       */
      error OwnableInvalidOwner(address owner);
  
      event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
  
      /**
       * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
       */
      constructor(address initialOwner) {
          if (initialOwner == address(0)) {
              revert OwnableInvalidOwner(address(0));
          }
          _transferOwnership(initialOwner);
      }
  
      /**
       * @dev Throws if called by any account other than the owner.
       */
      modifier onlyOwner() {
          _checkOwner();
          _;
      }
  
      /**
       * @dev Returns the address of the current owner.
       */
      function owner() public view virtual returns (address) {
          return _owner;
      }
  
      /**
       * @dev Throws if the sender is not the owner.
       */
      function _checkOwner() internal view virtual {
          if (owner() != _msgSender()) {
              revert OwnableUnauthorizedAccount(_msgSender());
          }
      }
  
      /**
       * @dev Leaves the contract without owner. It will not be possible to call
       * `onlyOwner` functions. Can only be called by the current owner.
       *
       * NOTE: Renouncing ownership will leave the contract without an owner,
       * thereby disabling any functionality that is only available to the owner.
       */
      function renounceOwnership() public virtual onlyOwner {
          _transferOwnership(address(0));
      }
  
      /**
       * @dev Transfers ownership of the contract to a new account (`newOwner`).
       * Can only be called by the current owner.
       */
      function transferOwnership(address newOwner) public virtual onlyOwner {
          if (newOwner == address(0)) {
              revert OwnableInvalidOwner(address(0));
          }
          _transferOwnership(newOwner);
      }
  
      /**
       * @dev Transfers ownership of the contract to a new account (`newOwner`).
       * Internal function without access restriction.
       */
      function _transferOwnership(address newOwner) internal virtual {
          address oldOwner = _owner;
          _owner = newOwner;
          emit OwnershipTransferred(oldOwner, newOwner);
      }
  }
  
  // File: nef.sol
  
  
  
  pragma solidity ^0.8.0;
  
  
  
  
  
  
  
  
  pragma solidity ^0.8.0;
  
  
  /**
   * @dev Interface of ERC721A.
   */
  interface IERC721A {
      /**
       * The caller must own the token or be an approved operator.
       */
      error ApprovalCallerNotOwnerNorApproved();
  
      /**
       * The token does not exist.
       */
      error ApprovalQueryForNonexistentToken();
  
      /**
       * Cannot query the balance for the zero address.
       */
      error BalanceQueryForZeroAddress();
  
      /**
       * Cannot mint to the zero address.
       */
      error MintToZeroAddress();
  
      /**
       * The quantity of tokens minted must be more than zero.
       */
      error MintZeroQuantity();
  
      /**
       * The token does not exist.
       */
      error OwnerQueryForNonexistentToken();
  
      /**
       * The caller must own the token or be an approved operator.
       */
      error TransferCallerNotOwnerNorApproved();
  
      /**
       * The token must be owned by `from`.
       */
      error TransferFromIncorrectOwner();
  
      /**
       * Cannot safely transfer to a contract that does not implement the
       * ERC721Receiver interface.
       */
      error TransferToNonERC721ReceiverImplementer();
  
      /**
       * Cannot transfer to the zero address.
       */
      error TransferToZeroAddress();
  
      /**
       * The token does not exist.
       */
      error URIQueryForNonexistentToken();
  
      /**
       * The `quantity` minted with ERC2309 exceeds the safety limit.
       */
      error MintERC2309QuantityExceedsLimit();
  
      /**
       * The `extraData` cannot be set on an unintialized ownership slot.
       */
      error OwnershipNotInitializedForExtraData();
  
      // =============================================================
      //                            STRUCTS
      // =============================================================
  
      struct TokenOwnership {
          // The address of the owner.
          address addr;
          // Stores the start time of ownership with minimal overhead for tokenomics.
          uint64 startTimestamp;
          // Whether the token has been burned.
          bool burned;
          // Arbitrary data similar to `startTimestamp` that can be set via {_extraData}.
          uint24 extraData;
      }
  
      // =============================================================
      //                         TOKEN COUNTERS
      // =============================================================
  
      /**
       * @dev Returns the total number of tokens in existence.
       * Burned tokens will reduce the count.
       * To get the total number of tokens minted, please see {_totalMinted}.
       */
      function totalSupply() external view returns (uint256);
  
      // =============================================================
      //                            IERC165
      // =============================================================
  
      /**
       * @dev Returns true if this contract implements the interface defined by
       * `interfaceId`. See the corresponding
       * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
       * to learn more about how these ids are created.
       *
       * This function call must use less than 30000 gas.
       */
      function supportsInterface(bytes4 interfaceId) external view returns (bool);
  
      // =============================================================
      //                            IERC721
      // =============================================================
  
      /**
       * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
       */
      event Transfer(
          address indexed from,
          address indexed to,
          uint256 indexed tokenId
      );
  
      /**
       * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
       */
      event Approval(
          address indexed owner,
          address indexed approved,
          uint256 indexed tokenId
      );
  
      /**
       * @dev Emitted when `owner` enables or disables
       * (`approved`) `operator` to manage all of its assets.
       */
      event ApprovalForAll(
          address indexed owner,
          address indexed operator,
          bool approved
      );
  
      /**
       * @dev Returns the number of tokens in `owner`'s account.
       */
      function balanceOf(address owner) external view returns (uint256 balance);
  
      /**
       * @dev Returns the owner of the `tokenId` token.
       *
       * Requirements:
       *
       * - `tokenId` must exist.
       */
      function ownerOf(uint256 tokenId) external view returns (address owner);
  
      /**
       * @dev Safely transfers `tokenId` token from `from` to `to`,
       * checking first that contract recipients are aware of the ERC721 protocol
       * to prevent tokens from being forever locked.
       *
       * Requirements:
       *
       * - `from` cannot be the zero address.
       * - `to` cannot be the zero address.
       * - `tokenId` token must exist and be owned by `from`.
       * - If the caller is not `from`, it must be have been allowed to move
       * this token by either {approve} or {setApprovalForAll}.
       * - If `to` refers to a smart contract, it must implement
       * {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
       *
       * Emits a {Transfer} event.
       */
      function safeTransferFrom(
          address from,
          address to,
          uint256 tokenId,
          bytes calldata data
      ) external payable;
  
      /**
       * @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`.
       */
      function safeTransferFrom(
          address from,
          address to,
          uint256 tokenId
      ) external payable;
  
      /**
       * @dev Transfers `tokenId` from `from` to `to`.
       *
       * WARNING: Usage of this method is discouraged, use {safeTransferFrom}
       * whenever possible.
       *
       * Requirements:
       *
       * - `from` cannot be the zero address.
       * - `to` cannot be the zero address.
       * - `tokenId` token must be owned by `from`.
       * - If the caller is not `from`, it must be approved to move this token
       * by either {approve} or {setApprovalForAll}.
       *
       * Emits a {Transfer} event.
       */
      function transferFrom(
          address from,
          address to,
          uint256 tokenId
      ) external payable;
  
      /**
       * @dev Gives permission to `to` to transfer `tokenId` token to another account.
       * The approval is cleared when the token is transferred.
       *
       * Only a single account can be approved at a time, so approving the
       * zero address clears previous approvals.
       *
       * Requirements:
       *
       * - The caller must own the token or be an approved operator.
       * - `tokenId` must exist.
       *
       * Emits an {Approval} event.
       */
      function approve(address to, uint256 tokenId) external payable;
  
      /**
       * @dev Approve or remove `operator` as an operator for the caller.
       * Operators can call {transferFrom} or {safeTransferFrom}
       * for any token owned by the caller.
       *
       * Requirements:
       *
       * - The `operator` cannot be the caller.
       *
       * Emits an {ApprovalForAll} event.
       */
      function setApprovalForAll(address operator, bool _approved) external;
  
      /**
       * @dev Returns the account approved for `tokenId` token.
       *
       * Requirements:
       *
       * - `tokenId` must exist.
       */
      function getApproved(uint256 tokenId)
          external
          view
          returns (address operator);
  
      /**
       * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
       *
       * See {setApprovalForAll}.
       */
      function isApprovedForAll(address owner, address operator)
          external
          view
          returns (bool);
  
      // =============================================================
      //                        IERC721Metadata
      // =============================================================
  
      /**
       * @dev Returns the token collection name.
       */
      function name() external view returns (string memory);
  
      /**
       * @dev Returns the token collection symbol.
       */
      function symbol() external view returns (string memory);
  
      /**
       * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
       */
      function tokenURI(uint256 tokenId) external view returns (string memory);
  
      // =============================================================
      //                           IERC2309
      // =============================================================
  
      /**
       * @dev Emitted when tokens in `fromTokenId` to `toTokenId`
       * (inclusive) is transferred from `from` to `to`, as defined in the
       * [ERC2309](https://eips.ethereum.org/EIPS/eip-2309) standard.
       *
       * See {_mintERC2309} for more details.
       */
      event ConsecutiveTransfer(
          uint256 indexed fromTokenId,
          uint256 toTokenId,
          address indexed from,
          address indexed to
      );
  }
  
  /**
   * @dev Interface of ERC721 token receiver.
   */
  interface ERC721A__IERC721Receiver {
      function onERC721Received(
          address operator,
          address from,
          uint256 tokenId,
          bytes calldata data
      ) external returns (bytes4);
  }
  
  /**
   * @title ERC721A
   *
   * @dev Implementation of the [ERC721](https://eips.ethereum.org/EIPS/eip-721)
   * Non-Fungible Token Standard, including the Metadata extension.
   * Optimized for lower gas during batch mints.
   *
   * Token IDs are minted in sequential order (e.g. 0, 1, 2, 3, ...)
   * starting from `_startTokenId()`.
   *
   * Assumptions:
   *
   * - An owner cannot have more than 2**64 - 1 (max value of uint64) of supply.
   * - The maximum token ID cannot exceed 2**256 - 1 (max value of uint256).
   */
  contract ERC721A is IERC721A {
      // Bypass for a `--via-ir` bug (https://github.com/chiru-labs/ERC721A/pull/364).
      struct TokenApprovalRef {
          address value;
      }
  
      // =============================================================
      //                           CONSTANTS
      // =============================================================
  
      // Mask of an entry in packed address data.
      uint256 private constant _BITMASK_ADDRESS_DATA_ENTRY = (1 << 64) - 1;
  
      // The bit position of `numberMinted` in packed address data.
      uint256 private constant _BITPOS_NUMBER_MINTED = 64;
  
      // The bit position of `numberBurned` in packed address data.
      uint256 private constant _BITPOS_NUMBER_BURNED = 128;
  
      // The bit position of `aux` in packed address data.
      uint256 private constant _BITPOS_AUX = 192;
  
      // Mask of all 256 bits in packed address data except the 64 bits for `aux`.
      uint256 private constant _BITMASK_AUX_COMPLEMENT = (1 << 192) - 1;
  
      // The bit position of `startTimestamp` in packed ownership.
      uint256 private constant _BITPOS_START_TIMESTAMP = 160;
  
      // The bit mask of the `burned` bit in packed ownership.
      uint256 private constant _BITMASK_BURNED = 1 << 224;
  
      // The bit position of the `nextInitialized` bit in packed ownership.
      uint256 private constant _BITPOS_NEXT_INITIALIZED = 225;
  
      // The bit mask of the `nextInitialized` bit in packed ownership.
      uint256 private constant _BITMASK_NEXT_INITIALIZED = 1 << 225;
  
      // The bit position of `extraData` in packed ownership.
      uint256 private constant _BITPOS_EXTRA_DATA = 232;
  
      // Mask of all 256 bits in a packed ownership except the 24 bits for `extraData`.
      uint256 private constant _BITMASK_EXTRA_DATA_COMPLEMENT = (1 << 232) - 1;
  
      // The mask of the lower 160 bits for addresses.
      uint256 private constant _BITMASK_ADDRESS = (1 << 160) - 1;
  
      // The maximum `quantity` that can be minted with {_mintERC2309}.
      // This limit is to prevent overflows on the address data entries.
      // For a limit of 5000, a total of 3.689e15 calls to {_mintERC2309}
      // is required to cause an overflow, which is unrealistic.
      uint256 private constant _MAX_MINT_ERC2309_QUANTITY_LIMIT = 5000;
  
      // The `Transfer` event signature is given by:
      // `keccak256(bytes("Transfer(address,address,uint256)"))`.
      bytes32 private constant _TRANSFER_EVENT_SIGNATURE =
          0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef;
  
      // =============================================================
      //                            STORAGE
      // =============================================================
  
      // The next token ID to be minted.
      uint256 private _currentIndex;
  
      // The number of tokens burned.
      uint256 private _burnCounter;
  
      // Token name
      string private _name;
  
      // Token symbol
      string private _symbol;
  
      // Mapping from token ID to ownership details
      // An empty struct value does not necessarily mean the token is unowned.
      // See {_packedOwnershipOf} implementation for details.
      //
      // Bits Layout:
      // - [0..159]   `addr`
      // - [160..223] `startTimestamp`
      // - [224]      `burned`
      // - [225]      `nextInitialized`
      // - [232..255] `extraData`
      mapping(uint256 => uint256) private _packedOwnerships;
  
      // Mapping owner address to address data.
      //
      // Bits Layout:
      // - [0..63]    `balance`
      // - [64..127]  `numberMinted`
      // - [128..191] `numberBurned`
      // - [192..255] `aux`
      mapping(address => uint256) private _packedAddressData;
  
      // Mapping from token ID to approved address.
      mapping(uint256 => TokenApprovalRef) private _tokenApprovals;
  
      // Mapping from owner to operator approvals
      mapping(address => mapping(address => bool)) private _operatorApprovals;
  
      // =============================================================
      //                          CONSTRUCTOR
      // =============================================================
  
      constructor(string memory name_, string memory symbol_) {
          _name = name_;
          _symbol = symbol_;
          _currentIndex = _startTokenId();
      }
  
      // =============================================================
      //                   TOKEN COUNTING OPERATIONS
      // =============================================================
  
      /**
       * @dev Returns the starting token ID.
       * To change the starting token ID, please override this function.
       */
      function _startTokenId() internal view virtual returns (uint256) {
          return 1;
      }
  
      /**
       * @dev Returns the next token ID to be minted.
       */
      function _nextTokenId() internal view virtual returns (uint256) {
          return _currentIndex;
      }
  
      /**
       * @dev Returns the total number of tokens in existence.
       * Burned tokens will reduce the count.
       * To get the total number of tokens minted, please see {_totalMinted}.
       */
      function totalSupply() public view virtual override returns (uint256) {
          // Counter underflow is impossible as _burnCounter cannot be incremented
          // more than `_currentIndex - _startTokenId()` times.
          unchecked {
              return _currentIndex - _burnCounter - _startTokenId();
          }
      }
  
      /**
       * @dev Returns the total amount of tokens minted in the contract.
       */
      function _totalMinted() internal view virtual returns (uint256) {
          // Counter underflow is impossible as `_currentIndex` does not decrement,
          // and it is initialized to `_startTokenId()`.
          unchecked {
              return _currentIndex - _startTokenId();
          }
      }
  
      /**
       * @dev Returns the total number of tokens burned.
       */
      function _totalBurned() internal view virtual returns (uint256) {
          return _burnCounter;
      }
  
      // =============================================================
      //                    ADDRESS DATA OPERATIONS
      // =============================================================
  
      /**
       * @dev Returns the number of tokens in `owner`'s account.
       */
      function balanceOf(address owner)
          public
          view
          virtual
          override
          returns (uint256)
      {
          if (owner == address(0)) revert BalanceQueryForZeroAddress();
          return _packedAddressData[owner] & _BITMASK_ADDRESS_DATA_ENTRY;
      }
  
      /**
       * Returns the number of tokens minted by `owner`.
       */
      function _numberMinted(address owner) internal view returns (uint256) {
          return
              (_packedAddressData[owner] >> _BITPOS_NUMBER_MINTED) &
              _BITMASK_ADDRESS_DATA_ENTRY;
      }
  
      /**
       * Returns the number of tokens burned by or on behalf of `owner`.
       */
      function _numberBurned(address owner) internal view returns (uint256) {
          return
              (_packedAddressData[owner] >> _BITPOS_NUMBER_BURNED) &
              _BITMASK_ADDRESS_DATA_ENTRY;
      }
  
      /**
       * Returns the auxiliary data for `owner`. (e.g. number of whitelist mint slots used).
       */
      function _getAux(address owner) internal view returns (uint64) {
          return uint64(_packedAddressData[owner] >> _BITPOS_AUX);
      }
  
      /**
       * Sets the auxiliary data for `owner`. (e.g. number of whitelist mint slots used).
       * If there are multiple variables, please pack them into a uint64.
       */
      function _setAux(address owner, uint64 aux) internal virtual {
          uint256 packed = _packedAddressData[owner];
          uint256 auxCasted;
          // Cast `aux` with assembly to avoid redundant masking.
          assembly {
              auxCasted := aux
          }
          packed =
              (packed & _BITMASK_AUX_COMPLEMENT) |
              (auxCasted << _BITPOS_AUX);
          _packedAddressData[owner] = packed;
      }
  
      // =============================================================
      //                            IERC165
      // =============================================================
  
      /**
       * @dev Returns true if this contract implements the interface defined by
       * `interfaceId`. See the corresponding
       * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
       * to learn more about how these ids are created.
       *
       * This function call must use less than 30000 gas.
       */
      function supportsInterface(bytes4 interfaceId)
          public
          view
          virtual
          override
          returns (bool)
      {
          // The interface IDs are constants representing the first 4 bytes
          // of the XOR of all function selectors in the interface.
          // See: [ERC165](https://eips.ethereum.org/EIPS/eip-165)
          // (e.g. `bytes4(i.functionA.selector ^ i.functionB.selector ^ ...)`)
          return
              interfaceId == 0x01ffc9a7 || // ERC165 interface ID for ERC165.
              interfaceId == 0x80ac58cd || // ERC165 interface ID for ERC721.
              interfaceId == 0x5b5e139f; // ERC165 interface ID for ERC721Metadata.
      }
  
      // =============================================================
      //                        IERC721Metadata
      // =============================================================
  
      /**
       * @dev Returns the token collection name.
       */
      function name() public view virtual override returns (string memory) {
          return _name;
      }
  
      /**
       * @dev Returns the token collection symbol.
       */
      function symbol() public view virtual override returns (string memory) {
          return _symbol;
      }
  
      /**
       * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
       */
      function tokenURI(uint256 tokenId)
          public
          view
          virtual
          override
          returns (string memory)
      {
          if (!_exists(tokenId)) revert URIQueryForNonexistentToken();
  
          string memory baseURI = _baseURI();
          return
              bytes(baseURI).length != 0
                  ? string(abi.encodePacked(baseURI, _toString(tokenId)))
                  : "";
      }
  
      /**
       * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
       * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
       * by default, it can be overridden in child contracts.
       */
      function _baseURI() internal view virtual returns (string memory) {
          return "";
      }
  
      // =============================================================
      //                     OWNERSHIPS OPERATIONS
      // =============================================================
  
      /**
       * @dev Returns the owner of the `tokenId` token.
       *
       * Requirements:
       *
       * - `tokenId` must exist.
       */
      function ownerOf(uint256 tokenId)
          public
          view
          virtual
          override
          returns (address)
      {
          return address(uint160(_packedOwnershipOf(tokenId)));
      }
  
      /**
       * @dev Gas spent here starts off proportional to the maximum mint batch size.
       * It gradually moves to O(1) as tokens get transferred around over time.
       */
      function _ownershipOf(uint256 tokenId)
          internal
          view
          virtual
          returns (TokenOwnership memory)
      {
          return _unpackedOwnership(_packedOwnershipOf(tokenId));
      }
  
      /**
       * @dev Returns the unpacked `TokenOwnership` struct at `index`.
       */
      function _ownershipAt(uint256 index)
          internal
          view
          virtual
          returns (TokenOwnership memory)
      {
          return _unpackedOwnership(_packedOwnerships[index]);
      }
  
      /**
       * @dev Initializes the ownership slot minted at `index` for efficiency purposes.
       */
      function _initializeOwnershipAt(uint256 index) internal virtual {
          if (_packedOwnerships[index] == 0) {
              _packedOwnerships[index] = _packedOwnershipOf(index);
          }
      }
  
      /**
       * Returns the packed ownership data of `tokenId`.
       */
      function _packedOwnershipOf(uint256 tokenId)
          private
          view
          returns (uint256)
      {
          uint256 curr = tokenId;
  
          unchecked {
              if (_startTokenId() <= curr)
                  if (curr < _currentIndex) {
                      uint256 packed = _packedOwnerships[curr];
                      // If not burned.
                      if (packed & _BITMASK_BURNED == 0) {
                          // Invariant:
                          // There will always be an initialized ownership slot
                          // (i.e. `ownership.addr != address(0) && ownership.burned == false`)
                          // before an unintialized ownership slot
                          // (i.e. `ownership.addr == address(0) && ownership.burned == false`)
                          // Hence, `curr` will not underflow.
                          //
                          // We can directly compare the packed value.
                          // If the address is zero, packed will be zero.
                          while (packed == 0) {
                              packed = _packedOwnerships[--curr];
                          }
                          return packed;
                      }
                  }
          }
          revert OwnerQueryForNonexistentToken();
      }
  
      /**
       * @dev Returns the unpacked `TokenOwnership` struct from `packed`.
       */
      function _unpackedOwnership(uint256 packed)
          private
          pure
          returns (TokenOwnership memory ownership)
      {
          ownership.addr = address(uint160(packed));
          ownership.startTimestamp = uint64(packed >> _BITPOS_START_TIMESTAMP);
          ownership.burned = packed & _BITMASK_BURNED != 0;
          ownership.extraData = uint24(packed >> _BITPOS_EXTRA_DATA);
      }
  
      /**
       * @dev Packs ownership data into a single uint256.
       */
      function _packOwnershipData(address owner, uint256 flags)
          private
          view
          returns (uint256 result)
      {
          assembly {
              // Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean.
              owner := and(owner, _BITMASK_ADDRESS)
              // `owner | (block.timestamp << _BITPOS_START_TIMESTAMP) | flags`.
              result := or(
                  owner,
                  or(shl(_BITPOS_START_TIMESTAMP, timestamp()), flags)
              )
          }
      }
  
      /**
       * @dev Returns the `nextInitialized` flag set if `quantity` equals 1.
       */
      function _nextInitializedFlag(uint256 quantity)
          private
          pure
          returns (uint256 result)
      {
          // For branchless setting of the `nextInitialized` flag.
          assembly {
              // `(quantity == 1) << _BITPOS_NEXT_INITIALIZED`.
              result := shl(_BITPOS_NEXT_INITIALIZED, eq(quantity, 1))
          }
      }
  
      // =============================================================
      //                      APPROVAL OPERATIONS
      // =============================================================
  
      /**
       * @dev Gives permission to `to` to transfer `tokenId` token to another account.
       * The approval is cleared when the token is transferred.
       *
       * Only a single account can be approved at a time, so approving the
       * zero address clears previous approvals.
       *
       * Requirements:
       *
       * - The caller must own the token or be an approved operator.
       * - `tokenId` must exist.
       *
       * Emits an {Approval} event.
       */
      function approve(address to, uint256 tokenId)
          public
          payable
          virtual
          override
      {
          address owner = ownerOf(tokenId);
  
          if (_msgSenderERC721A() != owner)
              if (!isApprovedForAll(owner, _msgSenderERC721A())) {
                  revert ApprovalCallerNotOwnerNorApproved();
              }
  
          _tokenApprovals[tokenId].value = to;
          emit Approval(owner, to, tokenId);
      }
  
      /**
       * @dev Returns the account approved for `tokenId` token.
       *
       * Requirements:
       *
       * - `tokenId` must exist.
       */
      function getApproved(uint256 tokenId)
          public
          view
          virtual
          override
          returns (address)
      {
          if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();
  
          return _tokenApprovals[tokenId].value;
      }
  
      /**
       * @dev Approve or remove `operator` as an operator for the caller.
       * Operators can call {transferFrom} or {safeTransferFrom}
       * for any token owned by the caller.
       *
       * Requirements:
       *
       * - The `operator` cannot be the caller.
       *
       * Emits an {ApprovalForAll} event.
       */
      function setApprovalForAll(address operator, bool approved)
          public
          virtual
          override
      {
          _operatorApprovals[_msgSenderERC721A()][operator] = approved;
          emit ApprovalForAll(_msgSenderERC721A(), operator, approved);
      }
  
      /**
       * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
       *
       * See {setApprovalForAll}.
       */
      function isApprovedForAll(address owner, address operator)
          public
          view
          virtual
          override
          returns (bool)
      {
          return _operatorApprovals[owner][operator];
      }
  
      /**
       * @dev Returns whether `tokenId` exists.
       *
       * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
       *
       * Tokens start existing when they are minted. See {_mint}.
       */
      function _exists(uint256 tokenId) internal view virtual returns (bool) {
          return
              _startTokenId() <= tokenId &&
              tokenId < _currentIndex && // If within bounds,
              _packedOwnerships[tokenId] & _BITMASK_BURNED == 0; // and not burned.
      }
  
      /**
       * @dev Returns whether `msgSender` is equal to `approvedAddress` or `owner`.
       */
      function _isSenderApprovedOrOwner(
          address approvedAddress,
          address owner,
          address msgSender
      ) private pure returns (bool result) {
          assembly {
              // Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean.
              owner := and(owner, _BITMASK_ADDRESS)
              // Mask `msgSender` to the lower 160 bits, in case the upper bits somehow aren't clean.
              msgSender := and(msgSender, _BITMASK_ADDRESS)
              // `msgSender == owner || msgSender == approvedAddress`.
              result := or(eq(msgSender, owner), eq(msgSender, approvedAddress))
          }
      }
  
      /**
       * @dev Returns the storage slot and value for the approved address of `tokenId`.
       */
      function _getApprovedSlotAndAddress(uint256 tokenId)
          private
          view
          returns (uint256 approvedAddressSlot, address approvedAddress)
      {
          TokenApprovalRef storage tokenApproval = _tokenApprovals[tokenId];
          // The following is equivalent to `approvedAddress = _tokenApprovals[tokenId].value`.
          assembly {
              approvedAddressSlot := tokenApproval.slot
              approvedAddress := sload(approvedAddressSlot)
          }
      }
  
      // =============================================================
      //                      TRANSFER OPERATIONS
      // =============================================================
  
      /**
       * @dev Transfers `tokenId` from `from` to `to`.
       *
       * Requirements:
       *
       * - `from` cannot be the zero address.
       * - `to` cannot be the zero address.
       * - `tokenId` token must be owned by `from`.
       * - If the caller is not `from`, it must be approved to move this token
       * by either {approve} or {setApprovalForAll}.
       *
       * Emits a {Transfer} event.
       */
      function transferFrom(
          address from,
          address to,
          uint256 tokenId
      ) public payable virtual override {
          uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);
  
          if (address(uint160(prevOwnershipPacked)) != from)
              revert TransferFromIncorrectOwner();
  
          (
              uint256 approvedAddressSlot,
              address approvedAddress
          ) = _getApprovedSlotAndAddress(tokenId);
  
          // The nested ifs save around 20+ gas over a compound boolean condition.
          if (
              !_isSenderApprovedOrOwner(
                  approvedAddress,
                  from,
                  _msgSenderERC721A()
              )
          )
              if (!isApprovedForAll(from, _msgSenderERC721A()))
                  revert TransferCallerNotOwnerNorApproved();
  
          if (to == address(0)) revert TransferToZeroAddress();
  
          _beforeTokenTransfers(from, to, tokenId, 1);
  
          // Clear approvals from the previous owner.
          assembly {
              if approvedAddress {
                  // This is equivalent to `delete _tokenApprovals[tokenId]`.
                  sstore(approvedAddressSlot, 0)
              }
          }
  
          // Underflow of the sender's balance is impossible because we check for
          // ownership above and the recipient's balance can't realistically overflow.
          // Counter overflow is incredibly unrealistic as `tokenId` would have to be 2**256.
          unchecked {
              // We can directly increment and decrement the balances.
              --_packedAddressData[from]; // Updates: `balance -= 1`.
              ++_packedAddressData[to]; // Updates: `balance += 1`.
  
              // Updates:
              // - `address` to the next owner.
              // - `startTimestamp` to the timestamp of transfering.
              // - `burned` to `false`.
              // - `nextInitialized` to `true`.
              _packedOwnerships[tokenId] = _packOwnershipData(
                  to,
                  _BITMASK_NEXT_INITIALIZED |
                      _nextExtraData(from, to, prevOwnershipPacked)
              );
  
              // If the next slot may not have been initialized (i.e. `nextInitialized == false`) .
              if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) {
                  uint256 nextTokenId = tokenId + 1;
                  // If the next slot's address is zero and not burned (i.e. packed value is zero).
                  if (_packedOwnerships[nextTokenId] == 0) {
                      // If the next slot is within bounds.
                      if (nextTokenId != _currentIndex) {
                          // Initialize the next slot to maintain correctness for `ownerOf(tokenId + 1)`.
                          _packedOwnerships[nextTokenId] = prevOwnershipPacked;
                      }
                  }
              }
          }
  
          emit Transfer(from, to, tokenId);
          _afterTokenTransfers(from, to, tokenId, 1);
      }
  
      /**
       * @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`.
       */
      function safeTransferFrom(
          address from,
          address to,
          uint256 tokenId
      ) public payable virtual override {
          safeTransferFrom(from, to, tokenId, "");
      }
  
      /**
       * @dev Safely transfers `tokenId` token from `from` to `to`.
       *
       * Requirements:
       *
       * - `from` cannot be the zero address.
       * - `to` cannot be the zero address.
       * - `tokenId` token must exist and be owned by `from`.
       * - If the caller is not `from`, it must be approved to move this token
       * by either {approve} or {setApprovalForAll}.
       * - If `to` refers to a smart contract, it must implement
       * {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
       *
       * Emits a {Transfer} event.
       */
      function safeTransferFrom(
          address from,
          address to,
          uint256 tokenId,
          bytes memory _data
      ) public payable virtual override {
          transferFrom(from, to, tokenId);
          if (to.code.length != 0)
              if (!_checkContractOnERC721Received(from, to, tokenId, _data)) {
                  revert TransferToNonERC721ReceiverImplementer();
              }
      }
  
      /**
       * @dev Hook that is called before a set of serially-ordered token IDs
       * are about to be transferred. This includes minting.
       * And also called before burning one token.
       *
       * `startTokenId` - the first token ID to be transferred.
       * `quantity` - the amount to be transferred.
       *
       * Calling conditions:
       *
       * - When `from` and `to` are both non-zero, `from`'s `tokenId` will be
       * transferred to `to`.
       * - When `from` is zero, `tokenId` will be minted for `to`.
       * - When `to` is zero, `tokenId` will be burned by `from`.
       * - `from` and `to` are never both zero.
       */
      function _beforeTokenTransfers(
          address from,
          address to,
          uint256 startTokenId,
          uint256 quantity
      ) internal virtual {}
  
      /**
       * @dev Hook that is called after a set of serially-ordered token IDs
       * have been transferred. This includes minting.
       * And also called after one token has been burned.
       *
       * `startTokenId` - the first token ID to be transferred.
       * `quantity` - the amount to be transferred.
       *
       * Calling conditions:
       *
       * - When `from` and `to` are both non-zero, `from`'s `tokenId` has been
       * transferred to `to`.
       * - When `from` is zero, `tokenId` has been minted for `to`.
       * - When `to` is zero, `tokenId` has been burned by `from`.
       * - `from` and `to` are never both zero.
       */
      function _afterTokenTransfers(
          address from,
          address to,
          uint256 startTokenId,
          uint256 quantity
      ) internal virtual {}
  
      /**
       * @dev Private function to invoke {IERC721Receiver-onERC721Received} on a target contract.
       *
       * `from` - Previous owner of the given token ID.
       * `to` - Target address that will receive the token.
       * `tokenId` - Token ID to be transferred.
       * `_data` - Optional data to send along with the call.
       *
       * Returns whether the call correctly returned the expected magic value.
       */
      function _checkContractOnERC721Received(
          address from,
          address to,
          uint256 tokenId,
          bytes memory _data
      ) private returns (bool) {
          try
              ERC721A__IERC721Receiver(to).onERC721Received(
                  _msgSenderERC721A(),
                  from,
                  tokenId,
                  _data
              )
          returns (bytes4 retval) {
              return
                  retval ==
                  ERC721A__IERC721Receiver(to).onERC721Received.selector;
          } catch (bytes memory reason) {
              if (reason.length == 0) {
                  revert TransferToNonERC721ReceiverImplementer();
              } else {
                  assembly {
                      revert(add(32, reason), mload(reason))
                  }
              }
          }
      }
  
      // =============================================================
      //                        MINT OPERATIONS
      // =============================================================
  
      /**
       * @dev Mints `quantity` tokens and transfers them to `to`.
       *
       * Requirements:
       *
       * - `to` cannot be the zero address.
       * - `quantity` must be greater than 0.
       *
       * Emits a {Transfer} event for each mint.
       */
      function _mint(address to, uint256 quantity) internal virtual {
          uint256 startTokenId = _currentIndex;
          if (quantity == 0) revert MintZeroQuantity();
  
          _beforeTokenTransfers(address(0), to, startTokenId, quantity);
  
          // Overflows are incredibly unrealistic.
          // `balance` and `numberMinted` have a maximum limit of 2**64.
          // `tokenId` has a maximum limit of 2**256.
          unchecked {
              // Updates:
              // - `balance += quantity`.
              // - `numberMinted += quantity`.
              //
              // We can directly add to the `balance` and `numberMinted`.
              _packedAddressData[to] +=
                  quantity *
                  ((1 << _BITPOS_NUMBER_MINTED) | 1);
  
              // Updates:
              // - `address` to the owner.
              // - `startTimestamp` to the timestamp of minting.
              // - `burned` to `false`.
              // - `nextInitialized` to `quantity == 1`.
              _packedOwnerships[startTokenId] = _packOwnershipData(
                  to,
                  _nextInitializedFlag(quantity) |
                      _nextExtraData(address(0), to, 0)
              );
  
              uint256 toMasked;
              uint256 end = startTokenId + quantity;
  
              // Use assembly to loop and emit the `Transfer` event for gas savings.
              // The duplicated `log4` removes an extra check and reduces stack juggling.
              // The assembly, together with the surrounding Solidity code, have been
              // delicately arranged to nudge the compiler into producing optimized opcodes.
              assembly {
                  // Mask `to` to the lower 160 bits, in case the upper bits somehow aren't clean.
                  toMasked := and(to, _BITMASK_ADDRESS)
                  // Emit the `Transfer` event.
                  log4(
                      0, // Start of data (0, since no data).
                      0, // End of data (0, since no data).
                      _TRANSFER_EVENT_SIGNATURE, // Signature.
                      0, // `address(0)`.
                      toMasked, // `to`.
                      startTokenId // `tokenId`.
                  )
  
                  // The `iszero(eq(,))` check ensures that large values of `quantity`
                  // that overflows uint256 will make the loop run out of gas.
                  // The compiler will optimize the `iszero` away for performance.
                  for {
                      let tokenId := add(startTokenId, 1)
                  } iszero(eq(tokenId, end)) {
                      tokenId := add(tokenId, 1)
                  } {
                      // Emit the `Transfer` event. Similar to above.
                      log4(0, 0, _TRANSFER_EVENT_SIGNATURE, 0, toMasked, tokenId)
                  }
              }
              if (toMasked == 0) revert MintToZeroAddress();
  
              _currentIndex = end;
          }
          _afterTokenTransfers(address(0), to, startTokenId, quantity);
      }
  
      /**
       * @dev Mints `quantity` tokens and transfers them to `to`.
       *
       * This function is intended for efficient minting only during contract creation.
       *
       * It emits only one {ConsecutiveTransfer} as defined in
       * [ERC2309](https://eips.ethereum.org/EIPS/eip-2309),
       * instead of a sequence of {Transfer} event(s).
       *
       * Calling this function outside of contract creation WILL make your contract
       * non-compliant with the ERC721 standard.
       * For full ERC721 compliance, substituting ERC721 {Transfer} event(s) with the ERC2309
       * {ConsecutiveTransfer} event is only permissible during contract creation.
       *
       * Requirements:
       *
       * - `to` cannot be the zero address.
       * - `quantity` must be greater than 0.
       *
       * Emits a {ConsecutiveTransfer} event.
       */
      function _mintERC2309(address to, uint256 quantity) internal virtual {
          uint256 startTokenId = _currentIndex;
          if (to == address(0)) revert MintToZeroAddress();
          if (quantity == 0) revert MintZeroQuantity();
          if (quantity > _MAX_MINT_ERC2309_QUANTITY_LIMIT)
              revert MintERC2309QuantityExceedsLimit();
  
          _beforeTokenTransfers(address(0), to, startTokenId, quantity);
  
          // Overflows are unrealistic due to the above check for `quantity` to be below the limit.
          unchecked {
              // Updates:
              // - `balance += quantity`.
              // - `numberMinted += quantity`.
              //
              // We can directly add to the `balance` and `numberMinted`.
              _packedAddressData[to] +=
                  quantity *
                  ((1 << _BITPOS_NUMBER_MINTED) | 1);
  
              // Updates:
              // - `address` to the owner.
              // - `startTimestamp` to the timestamp of minting.
              // - `burned` to `false`.
              // - `nextInitialized` to `quantity == 1`.
              _packedOwnerships[startTokenId] = _packOwnershipData(
                  to,
                  _nextInitializedFlag(quantity) |
                      _nextExtraData(address(0), to, 0)
              );
  
              emit ConsecutiveTransfer(
                  startTokenId,
                  startTokenId + quantity - 1,
                  address(0),
                  to
              );
  
              _currentIndex = startTokenId + quantity;
          }
          _afterTokenTransfers(address(0), to, startTokenId, quantity);
      }
  
      /**
       * @dev Safely mints `quantity` tokens and transfers them to `to`.
       *
       * Requirements:
       *
       * - If `to` refers to a smart contract, it must implement
       * {IERC721Receiver-onERC721Received}, which is called for each safe transfer.
       * - `quantity` must be greater than 0.
       *
       * See {_mint}.
       *
       * Emits a {Transfer} event for each mint.
       */
      function _safeMint(
          address to,
          uint256 quantity,
          bytes memory _data
      ) internal virtual {
          _mint(to, quantity);
  
          unchecked {
              if (to.code.length != 0) {
                  uint256 end = _currentIndex;
                  uint256 index = end - quantity;
                  do {
                      if (
                          !_checkContractOnERC721Received(
                              address(0),
                              to,
                              index++,
                              _data
                          )
                      ) {
                          revert TransferToNonERC721ReceiverImplementer();
                      }
                  } while (index < end);
                  // Reentrancy protection.
                  if (_currentIndex != end) revert();
              }
          }
      }
  
      /**
       * @dev Equivalent to `_safeMint(to, quantity, '')`.
       */
      function _safeMint(address to, uint256 quantity) internal virtual {
          _safeMint(to, quantity, "");
      }
  
      // =============================================================
      //                        BURN OPERATIONS
      // =============================================================
  
      /**
       * @dev Equivalent to `_burn(tokenId, false)`.
       */
      function _burn(uint256 tokenId) internal virtual {
          _burn(tokenId, false);
      }
  
      /**
       * @dev Destroys `tokenId`.
       * The approval is cleared when the token is burned.
       *
       * Requirements:
       *
       * - `tokenId` must exist.
       *
       * Emits a {Transfer} event.
       */
      function _burn(uint256 tokenId, bool approvalCheck) internal virtual {
          uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);
  
          address from = address(uint160(prevOwnershipPacked));
  
          (
              uint256 approvedAddressSlot,
              address approvedAddress
          ) = _getApprovedSlotAndAddress(tokenId);
  
          if (approvalCheck) {
              // The nested ifs save around 20+ gas over a compound boolean condition.
              if (
                  !_isSenderApprovedOrOwner(
                      approvedAddress,
                      from,
                      _msgSenderERC721A()
                  )
              )
                  if (!isApprovedForAll(from, _msgSenderERC721A()))
                      revert TransferCallerNotOwnerNorApproved();
          }
  
          _beforeTokenTransfers(from, address(0), tokenId, 1);
  
          // Clear approvals from the previous owner.
          assembly {
              if approvedAddress {
                  // This is equivalent to `delete _tokenApprovals[tokenId]`.
                  sstore(approvedAddressSlot, 0)
              }
          }
  
          // Underflow of the sender's balance is impossible because we check for
          // ownership above and the recipient's balance can't realistically overflow.
          // Counter overflow is incredibly unrealistic as `tokenId` would have to be 2**256.
          unchecked {
              // Updates:
              // - `balance -= 1`.
              // - `numberBurned += 1`.
              //
              // We can directly decrement the balance, and increment the number burned.
              // This is equivalent to `packed -= 1; packed += 1 << _BITPOS_NUMBER_BURNED;`.
              _packedAddressData[from] += (1 << _BITPOS_NUMBER_BURNED) - 1;
  
              // Updates:
              // - `address` to the last owner.
              // - `startTimestamp` to the timestamp of burning.
              // - `burned` to `true`.
              // - `nextInitialized` to `true`.
              _packedOwnerships[tokenId] = _packOwnershipData(
                  from,
                  (_BITMASK_BURNED | _BITMASK_NEXT_INITIALIZED) |
                      _nextExtraData(from, address(0), prevOwnershipPacked)
              );
  
              // If the next slot may not have been initialized (i.e. `nextInitialized == false`) .
              if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) {
                  uint256 nextTokenId = tokenId + 1;
                  // If the next slot's address is zero and not burned (i.e. packed value is zero).
                  if (_packedOwnerships[nextTokenId] == 0) {
                      // If the next slot is within bounds.
                      if (nextTokenId != _currentIndex) {
                          // Initialize the next slot to maintain correctness for `ownerOf(tokenId + 1)`.
                          _packedOwnerships[nextTokenId] = prevOwnershipPacked;
                      }
                  }
              }
          }
  
          emit Transfer(from, address(0), tokenId);
          _afterTokenTransfers(from, address(0), tokenId, 1);
  
          // Overflow not possible, as _burnCounter cannot be exceed _currentIndex times.
          unchecked {
              _burnCounter++;
          }
      }
  
      // =============================================================
      //                     EXTRA DATA OPERATIONS
      // =============================================================
  
      /**
       * @dev Directly sets the extra data for the ownership data `index`.
       */
      function _setExtraDataAt(uint256 index, uint24 extraData) internal virtual {
          uint256 packed = _packedOwnerships[index];
          if (packed == 0) revert OwnershipNotInitializedForExtraData();
          uint256 extraDataCasted;
          // Cast `extraData` with assembly to avoid redundant masking.
          assembly {
              extraDataCasted := extraData
          }
          packed =
              (packed & _BITMASK_EXTRA_DATA_COMPLEMENT) |
              (extraDataCasted << _BITPOS_EXTRA_DATA);
          _packedOwnerships[index] = packed;
      }
  
      /**
       * @dev Called during each token transfer to set the 24bit `extraData` field.
       * Intended to be overridden by the cosumer contract.
       *
       * `previousExtraData` - the value of `extraData` before transfer.
       *
       * Calling conditions:
       *
       * - When `from` and `to` are both non-zero, `from`'s `tokenId` will be
       * transferred to `to`.
       * - When `from` is zero, `tokenId` will be minted for `to`.
       * - When `to` is zero, `tokenId` will be burned by `from`.
       * - `from` and `to` are never both zero.
       */
      function _extraData(
          address from,
          address to,
          uint24 previousExtraData
      ) internal view virtual returns (uint24) {}
  
      /**
       * @dev Returns the next extra data for the packed ownership data.
       * The returned result is shifted into position.
       */
      function _nextExtraData(
          address from,
          address to,
          uint256 prevOwnershipPacked
      ) private view returns (uint256) {
          uint24 extraData = uint24(prevOwnershipPacked >> _BITPOS_EXTRA_DATA);
          return uint256(_extraData(from, to, extraData)) << _BITPOS_EXTRA_DATA;
      }
  
      // =============================================================
      //                       OTHER OPERATIONS
      // =============================================================
  
      /**
       * @dev Returns the message sender (defaults to `msg.sender`).
       *
       * If you are writing GSN compatible contracts, you need to override this function.
       */
      function _msgSenderERC721A() internal view virtual returns (address) {
          return msg.sender;
      }
  
      /**
       * @dev Converts a uint256 to its ASCII string decimal representation.
       */
      function _toString(uint256 value)
          internal
          pure
          virtual
          returns (string memory str)
      {
          assembly {
              // The maximum value of a uint256 contains 78 digits (1 byte per digit), but
              // we allocate 0xa0 bytes to keep the free memory pointer 32-byte word aligned.
              // We will need 1 word for the trailing zeros padding, 1 word for the length,
              // and 3 words for a maximum of 78 digits. Total: 5 * 0x20 = 0xa0.
              let m := add(mload(0x40), 0xa0)
              // Update the free memory pointer to allocate.
              mstore(0x40, m)
              // Assign the `str` to the end.
              str := sub(m, 0x20)
              // Zeroize the slot after the string.
              mstore(str, 0)
  
              // Cache the end of the memory to calculate the length later.
              let end := str
  
              // We write the string from rightmost digit to leftmost digit.
              // The following is essentially a do-while loop that also handles the zero case.
              // prettier-ignore
              for { let temp := value } 1 {} {
                  str := sub(str, 1)
                  // Write the character to the pointer.
                  // The ASCII index of the '0' character is 48.
                  mstore8(str, add(48, mod(temp, 10)))
                  // Keep dividing `temp` until zero.
                  temp := div(temp, 10)
                  // prettier-ignore
                  if iszero(temp) { break }
              }
  
              let length := sub(end, str)
              // Move the pointer 32 bytes leftwards to make room for the length.
              str := sub(str, 0x20)
              // Store the length.
              mstore(str, length)
          }
      }
  }
  
  /// @notice Optimized and flexible operator filterer to abide to OpenSea's
  /// mandatory on-chain royalty enforcement in order for new collections to
  /// receive royalties.
  /// For more information, see:
  /// See: https://github.com/ProjectOpenSea/operator-filter-registry
  abstract contract OperatorFilterer {
      /// @dev The default OpenSea operator blocklist subscription.
      address internal constant _DEFAULT_SUBSCRIPTION =
          0x3cc6CddA760b79bAfa08dF41ECFA224f810dCeB6;
  
      /// @dev The OpenSea operator filter registry.
      address internal constant _OPERATOR_FILTER_REGISTRY =
          0x000000000000AAeB6D7670E522A718067333cd4E;
  
      /// @dev Registers the current contract to OpenSea's operator filter,
      /// and subscribe to the default OpenSea operator blocklist.
      /// Note: Will not revert nor update existing settings for repeated registration.
      function _registerForOperatorFiltering() internal virtual {
          _registerForOperatorFiltering(_DEFAULT_SUBSCRIPTION, true);
      }
  
      /// @dev Registers the current contract to OpenSea's operator filter.
      /// Note: Will not revert nor update existing settings for repeated registration.
      function _registerForOperatorFiltering(
          address subscriptionOrRegistrantToCopy,
          bool subscribe
      ) internal virtual {
          /// @solidity memory-safe-assembly
          assembly {
              let functionSelector := 0x7d3e3dbe // `registerAndSubscribe(address,address)`.
  
              // Clean the upper 96 bits of `subscriptionOrRegistrantToCopy` in case they are dirty.
              subscriptionOrRegistrantToCopy := shr(
                  96,
                  shl(96, subscriptionOrRegistrantToCopy)
              )
              // prettier-ignore
              for {} iszero(subscribe) {} {
                  if iszero(subscriptionOrRegistrantToCopy) {
                      functionSelector := 0x4420e486 // `register(address)`.
                      break
                  }
                  functionSelector := 0xa0af2903 // `registerAndCopyEntries(address,address)`.
                  break
              }
              // Store the function selector.
              mstore(0x00, shl(224, functionSelector))
              // Store the `address(this)`.
              mstore(0x04, address())
              // Store the `subscriptionOrRegistrantToCopy`.
              mstore(0x24, subscriptionOrRegistrantToCopy)
              // Register into the registry.
              pop(
                  call(
                      gas(),
                      _OPERATOR_FILTER_REGISTRY,
                      0,
                      0x00,
                      0x44,
                      0x00,
                      0x00
                  )
              )
              // Restore the part of the free memory pointer that was overwritten,
              // which is guaranteed to be zero, because of Solidity's memory size limits.
              mstore(0x24, 0)
          }
      }
  
      /// @dev Modifier to guard a function and revert if `from` is a blocked operator.
      /// Can be turned on / off via `enabled`.
      /// For gas efficiency, you can use tight variable packing to efficiently read / write
      /// the boolean value for `enabled`.
      modifier onlyAllowedOperator(address from, bool enabled) virtual {
          /// @solidity memory-safe-assembly
          assembly {
              // This code prioritizes runtime gas costs on a chain with the registry.
              // As such, we will not use `extcodesize`, but rather abuse the behavior
              // of `staticcall` returning 1 when called on an empty / missing contract,
              // to avoid reverting when a chain does not have the registry.
  
              if enabled {
                  // Check if `from` is not equal to `msg.sender`,
                  // discarding the upper 96 bits of `from` in case they are dirty.
                  if iszero(eq(shr(96, shl(96, from)), caller())) {
                      // Store the function selector of `isOperatorAllowed(address,address)`,
                      // shifted left by 6 bytes, which is enough for 8tb of memory.
                      // We waste 6-3 = 3 bytes to save on 6 runtime gas (PUSH1 0x224 SHL).
                      mstore(0x00, 0xc6171134001122334455)
                      // Store the `address(this)`.
                      mstore(0x1a, address())
                      // Store the `msg.sender`.
                      mstore(0x3a, caller())
  
                      // `isOperatorAllowed` always returns true if it does not revert.
                      if iszero(
                          staticcall(
                              gas(),
                              _OPERATOR_FILTER_REGISTRY,
                              0x16,
                              0x44,
                              0x00,
                              0x00
                          )
                      ) {
                          // Bubble up the revert if the staticcall reverts.
                          returndatacopy(0x00, 0x00, returndatasize())
                          revert(0x00, returndatasize())
                      }
  
                      // We'll skip checking if `from` is inside the blacklist.
                      // Even though that can block transferring out of wrapper contracts,
                      // we don't want tokens to be stuck.
  
                      // Restore the part of the free memory pointer that was overwritten,
                      // which is guaranteed to be zero, if less than 8tb of memory is used.
                      mstore(0x3a, 0)
                  }
              }
          }
          _;
      }
  
      /// @dev Modifier to guard a function from approving a blocked operator.
      /// Can be turned on / off via `enabled`.
      /// For efficiency, you can use tight variable packing to efficiently read / write
      /// the boolean value for `enabled`.
      modifier onlyAllowedOperatorApproval(address operator, bool enabled)
          virtual {
          /// @solidity memory-safe-assembly
          assembly {
              // For more information on the optimization techniques used,
              // see the comments in `onlyAllowedOperator`.
  
              if enabled {
                  // Store the function selector of `isOperatorAllowed(address,address)`,
                  mstore(0x00, 0xc6171134001122334455)
                  // Store the `address(this)`.
                  mstore(0x1a, address())
                  // Store the `operator`, discarding the upper 96 bits in case they are dirty.
                  mstore(0x3a, shr(96, shl(96, operator)))
  
                  // `isOperatorAllowed` always returns true if it does not revert.
                  if iszero(
                      staticcall(
                          gas(),
                          _OPERATOR_FILTER_REGISTRY,
                          0x16,
                          0x44,
                          0x00,
                          0x00
                      )
                  ) {
                      // Bubble up the revert if the staticcall reverts.
                      returndatacopy(0x00, 0x00, returndatasize())
                      revert(0x00, returndatasize())
                  }
  
                  // Restore the part of the free memory pointer that was overwritten.
                  mstore(0x3a, 0)
              }
          }
          _;
      }
  }
  
  error AlreadyReservedTokens();
  error CallerNotOffsetter();
  error FunctionLocked();
  error InsufficientValue();
  error InsufficientMints();
  error InsufficientSupply();
  error InvalidSignature();
  error NoContractMinting();
  error ProvenanceHashAlreadySet();
  error ProvenanceHashNotSet();
  error TokenOffsetAlreadySet();
  error TokenOffsetNotSet();
  error WithdrawFailed();
  
  interface Offsetable {
      function setOffset(uint256 randomness) external;
  }
  
  contract Bust_of_Queen_Nefertiti is ERC721A, ERC2981, OperatorFilterer, Ownable {
      using ECDSA for bytes32;
  
      string private _baseTokenURI;
      bytes32 public merkleRoot;
      string public baseExtension = ".json";
      address public contractAddress1;
      uint256 public MAX_SUPPLY = 330;
      uint256 public constant RESERVED = 35;
      uint256 public PUBLIC_SUPPLY = 295;  
      uint256 public WHITELIST_SUPPLY = 295; 
      uint256 public mintPrice = 0.031 ether;
      uint256 public whiteListPrice = 0.023 ether;
      string public provenanceHash;
      bool public operatorFilteringEnabled;
      mapping(bytes4 => bool) public functionLocked;
      bool public publicSaleStatus = false;
      bool public whitelistSaleStatus = false;
      mapping(address => uint256) public Claimed;
      mapping(address => uint256) public minted;
      uint256 public totalClaimed = 0;
      uint256 public privateSaleStart;
  
      event WHITELISTMINT(address to, uint256 quantity);
      event PUBLICMINT(address to, uint256 quantity);
      
  
      constructor(
          address _royaltyReceiver,
          address initialOwner,
          uint96 _royaltyFraction
      ) ERC721A(unicode"Bust of Queen Nefertiti", unicode"Bust of Queen Nefertiti") Ownable(initialOwner) {
          _registerForOperatorFiltering();
          operatorFilteringEnabled = true;
          _setDefaultRoyalty(_royaltyReceiver, _royaltyFraction);
      }
  
      /**
       * @notice Modifier applied to functions that will be disabled when they're no longer needed
       */
      modifier lockable() {
          if (functionLocked[msg.sig]) revert FunctionLocked();
          _;
      }
  
  
      /**
       * @inheritdoc ERC721A
       */
      function supportsInterface(bytes4 interfaceId)
          public
          view
          override(ERC721A, ERC2981)
          returns (bool)
      {
          return
              ERC721A.supportsInterface(interfaceId) ||
              ERC2981.supportsInterface(interfaceId);
      }
  
      /**
       * @notice Override ERC721A _baseURI function to use base URI pattern
       */
      function _baseURI() internal view virtual override returns (string memory) {
          return _baseTokenURI;
      }
  
      function setBaseExtension(string memory _newBaseExtension)
          public
          onlyOwner
      {
          baseExtension = _newBaseExtension;
      }
  
      function tokenURI(uint256 tokenId)
          public
          view
          virtual
          override
          returns (string memory)
      {
          require(
              _exists(tokenId),
              "ERC721Metadata: URI query for nonexistent token"
          );
  
          string memory currentBaseURI = _baseURI();
          return
              bytes(currentBaseURI).length > 0
                  ? string(
                      abi.encodePacked(
                          currentBaseURI,
                          Strings.toString(tokenId),
                          baseExtension
                      )
                  )
                  : "";
      }
  
      /**
       * @notice Return the number of tokens an address has minted
       * @param account Address to return the number of tokens minted for
       */
      function numberMinted(address account) external view returns (uint256) {
          return _numberMinted(account);
      }
  
      /**
       * @notice Lock a function so that it can no longer be called
       * @dev WARNING: THIS CANNOT BE UNDONE
       * @param id Function signature
       */
      function lockFunction(bytes4 id) external onlyOwner {
          functionLocked[id] = true;
      }
  
      /**
       * @notice Set the state of the OpenSea operator filter
       * @param value Flag indicating if the operator filter should be applied to transfers and approvals
       */
      function setOperatorFilteringEnabled(bool value)
          external
          lockable
          onlyOwner
      {
          operatorFilteringEnabled = value;
      }
  
      /**
       * @notice Set new royalties settings for the collection
       * @param receiver Address to receive royalties
       * @param royaltyFraction Royalty fee respective to fee denominator (10_000)
       */
      function setRoyalties(address receiver, uint96 royaltyFraction)
          external
          onlyOwner
      {
          _setDefaultRoyalty(receiver, royaltyFraction);
      }
  
      /**
       * @notice Set token metadata base URI
       * @param _newBaseURI New base URI
       */
      function setBaseURI(string calldata _newBaseURI)
          external
          lockable
          onlyOwner
      {
          _baseTokenURI = _newBaseURI;
      }
  
      /**
       * @notice Set provenance hash for the collection
       * @param _provenanceHash New hash of the metadata
       */
      function setProvenanceHash(string calldata _provenanceHash)
          external
          lockable
          onlyOwner
      {
          if (bytes(provenanceHash).length != 0)
              revert ProvenanceHashAlreadySet();
  
          provenanceHash = _provenanceHash;
      }
  
      function setMerkleRoot(bytes32 _merkleRoot) external onlyOwner {
          merkleRoot = _merkleRoot;
      }
  
      /**
       * @notice Mint `RESERVED` amount of tokens to an address
       * @param to Address to send the reserved tokens
       */
      function reserve(address to) external lockable onlyOwner {
          if (_totalMinted() >= RESERVED) revert AlreadyReservedTokens();
          _mint(to, RESERVED);
      }
  
      function secondaryReserve(address to, uint256 quantity) external onlyOwner{
          require(_totalMinted() + quantity <= MAX_SUPPLY);
          _mint(to, quantity);
      }
  
      function whiteListMint(
          address to,
          uint256 quantity,
          bytes32[] calldata merkleProof,
          uint256 amount
      ) external payable{
          require(whitelistSaleStatus == true, "Minting is not yet open.");
          require(block.timestamp <= privateSaleStart + 2 hours, "sale time ended");
          require(_totalMinted() + amount <= MAX_SUPPLY , "Exceeds Maximum Supply" );
          require(
              Claimed[to] + amount <= quantity,
              "Invalid Whitelist Proof or Already Claimed"
          );
          require(
              totalClaimed + amount <= WHITELIST_SUPPLY,
              "All NFTs Claimed."
          );
          bytes32 node = keccak256(abi.encodePacked(to, quantity));
          require(
              MerkleProof.verify(merkleProof, merkleRoot, node),
              "Invalid Whitelist Proof."
          );
          uint256 totalCost = amount * whiteListPrice;
          require(msg.value >= totalCost, "Ether sent is not correct.");
          _mint(to, amount);
          totalClaimed += amount;
          Claimed[to] += amount;
          if (msg.value > totalCost) {
              payable(msg.sender).transfer(msg.value - totalCost);
          }
          emit WHITELISTMINT(to, quantity);
      }
  
      function publicMint(
          address to,
          uint256 quantity
      ) external payable{
          require(publicSaleStatus == true, "Minting is not yet open.");
          require(minted[to] + quantity <= 5, "NFT amount exceeds");
          require(_totalMinted() + quantity <= MAX_SUPPLY , "Exceeds Maximum Supply" );
          uint256 totalCost = quantity * mintPrice;
          require(msg.value >= totalCost, "Ether sent is not correct.");
          _mint(to, quantity);
          PUBLIC_SUPPLY -= quantity;
          minted[to] += quantity;
          if (msg.value > totalCost) {
              payable(msg.sender).transfer(msg.value - totalCost);
          }
          emit PUBLICMINT(to, quantity);
      }
  
      function setPublicMintPrice(uint256 _newPrice) external onlyOwner {
          mintPrice = _newPrice;
      }
  
      function setWhiteListPrice(uint256 _newPrice) external onlyOwner {
          whiteListPrice = _newPrice;
      }
  
      function setWhiteListSupply(uint256 _newSupply) external onlyOwner {
          WHITELIST_SUPPLY = _newSupply;
      }
  
      function setPublicSupply(uint256 _newSupply) external onlyOwner {
          PUBLIC_SUPPLY = _newSupply;
      }
  
      function enablePublicMint(bool _status) external onlyOwner {
              publicSaleStatus = _status;
      }
  
      function enablePrivateMint(bool _status) external onlyOwner {
              whitelistSaleStatus = _status;
              privateSaleStart = block.timestamp;
      }
  
      /**
       * @notice Withdraw all ETH sent to the contract
       */
      function withdraw() external onlyOwner {
          (bool success, ) = payable(msg.sender).call{
              value: address(this).balance
          }("");
          if (!success) revert WithdrawFailed();
      }
  
      /**
       * @notice Override to enforce OpenSea's operator filter requirement to receive collection royalties
       * @inheritdoc ERC721A
       */
      function setApprovalForAll(address operator, bool approved)
          public
          override
          onlyAllowedOperatorApproval(operator, operatorFilteringEnabled)
      {
          super.setApprovalForAll(operator, approved);
      }
  
      /**
       * @notice Override to enforce OpenSea's operator filter requirement to receive collection royalties
       * @inheritdoc ERC721A
       */
      function approve(address operator, uint256 tokenId)
          public
          payable
          override
          onlyAllowedOperatorApproval(operator, operatorFilteringEnabled)
      {
          super.approve(operator, tokenId);
      }
  
      /**
       * @notice Override to enforce OpenSea's operator filter requirement to receive collection royalties
       * @inheritdoc ERC721A
       */
      function transferFrom(
          address from,
          address to,
          uint256 tokenId
      )
          public
          payable
          override
          onlyAllowedOperator(from, operatorFilteringEnabled)
      {
          super.transferFrom(from, to, tokenId);
      }
  
      /**
       * @notice Override to enforce OpenSea's operator filter requirement to receive collection royalties
       * @inheritdoc ERC721A
       */
      function safeTransferFrom(
          address from,
          address to,
          uint256 tokenId
      )
          public
          payable
          override
          onlyAllowedOperator(from, operatorFilteringEnabled)
      {
          super.safeTransferFrom(from, to, tokenId);
      }
  
      /**
       * @notice Override to enforce OpenSea's operator filter requirement to receive collection royalties
       * @inheritdoc ERC721A
       */
      function safeTransferFrom(
          address from,
          address to,
          uint256 tokenId,
          bytes memory data
      )
          public
          payable
          override
          onlyAllowedOperator(from, operatorFilteringEnabled)
      {
          super.safeTransferFrom(from, to, tokenId, data);
      }
  }