#include <iostream>
#include <vector>
#include <cassert>
#include <climits>
#include <map>
using namespace std; 
 
#define pii pair<int, int>
 
int main() {
	cin.tie(0)->sync_with_stdio(0);
	int t; cin >> t;
	while (t--) {
		int n; cin >> n;
		vector<pii> a(n);
		map<int, int> mp1, mp2; //x + y, x
 
		for (auto &[x, y] : a) {
			cin >> x >> y;
			mp1[x + y]++;
			mp2[x]++;
		}
 
		int s = -1, c = -1; // c = x + y
		for (auto [x, cnt] : mp2) {
			if (cnt & 1) {
				s = x;
				break;
			}
		}
 
		for (auto [b, cnt] : mp1) {
			if (cnt & 1) {
				c = b;
				break;
			}
		}
 
		cout << s << " " << c - s << '\n';
	}
}
 
 
 
 
 
 

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NAoxCjIgMwozCi0yIC0xCi0xIC0yCi0xIC0zCjcKNyAyNgo2IDI3CjYgMjgKNyAyNwo4IDI2CjggMjcKNyAyOAoxMQo3MCA5CjY5IDgKNjkgMAo3MyA1CjcwIC0xCjcwIDUKNzEgNwo3MCA0CjczIDQKNzEgMwo3MiAzCg==

4
1
2 3
3
-2 -1
-1 -2
-1 -3
7
7 26
6 27
6 28
7 27
8 26
8 27
7 28
11
70 9
69 8
69 0
73 5
70 -1
70 5
71 7
70 4
73 4
71 3
72 3