#include <bits/stdc++.h>
// iostream is too mainstream
#include <cstdio>
// bitch please
#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <cmath>
#include <iomanip>
#include <time.h>
#define dibs reserve
#define OVER9000 1234567890
#define ALL_THE(CAKE,LIE) for(auto LIE =CAKE.begin(); LIE != CAKE.end(); LIE++)
#define tisic 47
#define soclose 1e-8
#define chocolate win
// so much chocolate
#define patkan 9
#define ff first
#define ss second
#define abs(x) (((x) < 0)?-(x):(x))
#define uint unsigned int
#define dbl long double
#define pi 3.14159265358979323846
using namespace std;
// mylittledoge

using cat = long long;

#ifdef DONLINE_JUDGE
	// palindromic tree is better than splay tree!
	#define lld I64d
#endif

int main() {
	cin.sync_with_stdio(0);
	cin.tie(0);
	cout << fixed << setprecision(10);
	int T;
	cin >> T;
	for(int t = 0; t < T; t++) {
		int N;
		cin >> N;
		vector< vector<int> > A(N, vector<int>(N));
		for(int i = 0; i < N*N; i++) cin >> A[i/N][i%N];
		int maxsum = 0;
		for(int i = -N; i <= N; i++) {
			int sum = 0;
			for(int s = 0; s <= 2*N; s++) if((s+i)%2 == 0)
				if((s+i)/2 < N && s-i >= 0 && s+i >= 0 && (s-i)/2 < N) 
					sum += A[(s+i)/2][(s-i)/2];
			maxsum = max(maxsum, sum);
		}
		cout << maxsum << "\n";
	}
	return 0;}

// look at my code
// my code is amazing