#include <bits/stdc++.h>

#include <atcoder/all>
using namespace std;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
#define FAST_IO                \
  ios::sync_with_stdio(false); \
  cin.tie(0);
const i64 INF = 1001001001001001001;
using Modint = atcoder::static_modint<998244353>;

int main() {
  FAST_IO

  int T;
  cin >> T;
  while (T--) {
    int N;
    cin >> N;
    vector<int> C((N - 1) * (N - 1), 0);
    for (auto& c : C) cin >> c;

    ranges::sort(C);

    vector A(N, vector(N, 0));
    int p = 0;
    for (int i = 1; i < N; i++) {
      if (i % 2) {
        for (int j = 1; j < N; j++) {
          int s = A[i - 1][j] + A[i][j - 1] + A[i - 1][j - 1];
          A[i][j] = C[p++] - s;
        }
      } else {
        for (int j = N - 2; j >= 0; j--) {
          int s = A[i - 1][j + 1] + A[i - 1][j] + A[i][j + 1];
          A[i][j] = C[p++] - s;
        }
      }
    }

    for (int i = 0; i < N; i ++) {
      for (int j = 0; j < N; j ++) {
        cout << A[i][j] << " ";
      }
      cout << "\n";
    }
  }
}