#include <bits/stdc++.h>
using namespace std;
 
int main() {
	int t;
	cin >> t;
	while(t--)
	{
		int n;
		cin >> n;
		int arr[n][n];
		vector<int> v;
		for(int i=0;i<n;i++)
		{
			for(int j=0;j<n;j++)
			{
				cin >> arr[i][j];
				v.push_back(arr[i][j]);
			}
		}
		unordered_set<int> st;
		vector<int> p;
		for(auto x : v)
		{
			if(st.find(x)==st.end())
			{
				p.push_back(x);
				st.insert(x);
			}
		}
		int sum=0;
		for(auto x : p)
		{
			sum = sum + x;
		}
		int m = (2*n*(2*n+1))/2;
		cout << m-sum << " ";
		for(auto x : p)
		{
			cout << x << " ";
		}
		cout << endl;
	}
	return 0;
}

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MwozCjEgNiAyCjYgMiA0CjIgNCAzCjEKMQoyCjIgMwozIDQK

3
3
1 6 2
6 2 4
2 4 3
1
1
2
2 3
3 4