
    In a delivery fleet management system, determine the number of vehicle pairs that can be scheduled for parallel routes during peak hours, where two vehicles are compatible for parallel scheduling if the XOR of their ID numbers results in an even number. Given a list of vehicle identification numbers, count how many pairs of vehicles can be assigned to run parallel delivery routes based on this compatibility rule.
    

    
def find_even_pair(A):
    """
    In a delivery fleet management system, determine the number of vehicle pairs that can be scheduled for parallel routes during peak hours, where two vehicles are compatible for parallel scheduling if the XOR of their ID numbers results in an even number. Given a list of vehicle identification numbers, count how many pairs of vehicles can be assigned to run parallel delivery routes based on this compatibility rule.
    

    """
def find_even_pair(A):
    """
    In a delivery fleet management system, determine the number of vehicle pairs that can be scheduled for parallel routes during peak hours, where two vehicles are compatible for parallel scheduling if the XOR of their ID numbers results in an even number. Given a list of vehicle identification numbers, count how many pairs of vehicles can be assigned to run parallel delivery routes based on this compatibility rule.
    

    """
    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