a = [((1, 6), (8, 2)), ((8, 2), (6, 3)), ((6, 3), (9, 4)), ((9, 4), (5, 7))]

A = [1,6], B = [8,2]

A = [8,2], B = [6,3]

C1 = (A[1]+B[1],A[2]+B[2])

C2 = (A[1]+B[1],A[2]+B[2])

X = [1,8,6,9,5]

Y = [6,2,3,4,7]

res = list(zip(X,Y))

a = list(zip(res, res[1:]))

print(a)

>>> a = [((1, 6), (8, 2)), ((8, 2), (6, 3)), ((6, 3), (9, 4)), ((9, 4), (5, 7))]
>>> A = a[0][0]; B = a[0][1]
>>> A
(1, 6)
>>> B
(8, 2)
>>>