def super_function(A):
    x = list(map(lambda a: a[0], A))
    y = list(map(lambda a: a[1], A))
    sets = set(A)
    D = max(x) + min(x)
    s = 0
    for i in range(len(A)):
            if (D-x[i],y[i]) in sets:
                s += 1
            else:
                break
    return(s == len(A))