
    Given a list of patient health indicators where each indicator is a binary value (0 or 1), determine the number of pairs of health metrics that, when combined (using XOR), indicate stable patient behavior patterns (resulting in an even number). Each pair represents the interaction between two distinct health factors, such as medication adherence and follow-up attendance, where stable combinations help assess readmission risk.
    

    
def find_even_pair(A):
    """
    Given a list of patient health indicators where each indicator is a binary value (0 or 1), determine the number of pairs of health metrics that, when combined (using XOR), indicate stable patient behavior patterns (resulting in an even number). Each pair represents the interaction between two distinct health factors, such as medication adherence and follow-up attendance, where stable combinations help assess readmission risk.
    

    """
def find_even_pair(A):
    """
    Given a list of patient health indicators where each indicator is a binary value (0 or 1), determine the number of pairs of health metrics that, when combined (using XOR), indicate stable patient behavior patterns (resulting in an even number). Each pair represents the interaction between two distinct health factors, such as medication adherence and follow-up attendance, where stable combinations help assess readmission risk.
    

    """
    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