
    Given a sequence of pixel intensity values from a medical scan, determine the number of pixel pairs whose XOR operation results in an even value, as these pairs may indicate symmetrical tissue patterns. Each intensity value in the sequence represents the brightness level of a specific region in the medical image, and identifying such pairs helps in automated anomaly detection.
    

    
def find_even_pair(A):
    """
    Given a sequence of pixel intensity values from a medical scan, determine the number of pixel pairs whose XOR operation results in an even value, as these pairs may indicate symmetrical tissue patterns. Each intensity value in the sequence represents the brightness level of a specific region in the medical image, and identifying such pairs helps in automated anomaly detection.
    

    """
def find_even_pair(A):
    """
    Given a sequence of pixel intensity values from a medical scan, determine the number of pixel pairs whose XOR operation results in an even value, as these pairs may indicate symmetrical tissue patterns. Each intensity value in the sequence represents the brightness level of a specific region in the medical image, and identifying such pairs helps in automated anomaly detection.
    

    """
    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