
    In a bank's real-time fraud detection system, write a function that analyzes pairs of transaction security codes from cross-channel activities to identify legitimate transaction patterns. Given a list of security codes from paired channel activities, determine the count of code pairs that, when XORed together, produce even numbers, as these represent potentially valid transactions.
    

    
def find_even_pair(A):
    """
    In a bank's real-time fraud detection system, write a function that analyzes pairs of transaction security codes from cross-channel activities to identify legitimate transaction patterns. Given a list of security codes from paired channel activities, determine the count of code pairs that, when XORed together, produce even numbers, as these represent potentially valid transactions.
    

    """
def find_even_pair(A):
    """
    In a bank's real-time fraud detection system, write a function that analyzes pairs of transaction security codes from cross-channel activities to identify legitimate transaction patterns. Given a list of security codes from paired channel activities, determine the count of code pairs that, when XORed together, produce even numbers, as these represent potentially valid transactions.
    

    """
    count = 0
    for i in range(0, len(A)):
        for j in range(i + 1, len(A)):
            if (A[i] ^ A[j]) % 2 == 0:
                count += 1
    return count