import random

title = "Subtraction in Base 2 Using 2's Complement"
description = "This module teaches subtraction in binary using the 2's complement method, which allows subtraction to be performed as an addition operation."

def generate_question():
    num1 = random.randint(1, 7)
    num2 = random.randint(1, 7)
    
    result = num1 - num2
    bit_length = 4
    if result >= 0:
        binary_result = bin(result)[2:].zfill(bit_length)
    else:
        binary_result = bin((1 << bit_length) + result)[2:]
    
    question = f"Subtract {num2} from {num1} in base 2 using 2's complement method."
    correct_answer = binary_result
    options = [correct_answer]
    
    # Generate incorrect options
    while len(options) < 5:
        fake_option = bin(random.randint(-7, 7) & 0xF)[2:]
        if fake_option not in options:
            options.append(fake_option)
    
    random.shuffle(options)
    explanation = (
        f"The result of subtracting {num2} from {num1} in base 2 using 2's complement is {binary_result}."
        "\n\n**Step-by-step solution:**\n"
        "1. Find the 2's complement of the subtracted number.\n"
        "2. Add it to the first number.\n"
        "3. If there's a carry, discard it. The result is the binary difference."
    )
    return question, options, correct_answer, explanation