Getting difficult to solve such easy questoin

help
21

What if you XOR all x coordinates and all y coordinates ? you will get a pair(X,Y) which will be the answer.
Link to the solution : CodeChef: Practical coding for everyone
OR

from functools import reduce
from operator import xor
for _ in range(int(input())) :
    n = int(input())
    l1 = []
    l2 = []
    for i in range(4*n - 1) :
        t1, t2 = map(int, input().split())
        l1.append(t1)
        l2.append(t2)
    x = reduce(xor, l1)
    y = reduce(xor, l2)
    print(x, y)
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