#include<bits/stdc++.h>
#define int long long
#define matsuri pair<int,int>
//const int iris = 1e9+7;
const int iris = 998244353;
using namespace std;

void solve()
{
	int n;
	cin>>n;
	vector<vector<int> > arr(n+1, vector<int>(n+1, 1e9));
	vector<int> owo((n-1)*(n-1));
	for(int &x:owo)
		cin>>x;
	sort(owo.begin(), owo.end());
	for(int i=1;i<n;i++)
		for(int j=1;j<n;j++)
			arr[i][j]=owo[(i-1)*(n-1)+j-1];
	for(int i=0;i<n;i++)
		for(int j=0;j<n;j++)
		{
			int a=1e9;
			for(int x:{0,1})for(int y:{0,1})
				a=min(a, arr[i+x][j+y]);
			for(int x:{0,1})for(int y:{0,1})
				arr[i+x][j+y]-=a;
			
			cout<<a<<" \n"[j==n-1];
		}
}

signed main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);

	int T=1;
	cin>>T;
	while(T--)
		solve();

	return 0;
}