#include <bits/stdc++.h>

#define int long long

using namespace std;

signed main() {
    ios_base::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
    int t;
    cin >> t;
    while(t--){
        int n, m;
        cin >> n >> m;
        vector<vector<int>> v(n + 2, vector<int>(m + 2, 0));
        for(int i = 1; i <= n; ++i){
            for(int j = 1; j <= m; ++j){
                cin >> v[i][j];
            }
        }

        for(int i = 1; i <= n; ++i){
            for(int j = 1; j <= m; ++j){
                v[i][j] = v[i][j] > max({v[i + 1][j], v[i - 1][j], v[i][j + 1], v[i][j - 1]}) ? max({v[i + 1][j], v[i - 1][j], v[i][j + 1], v[i][j - 1]}) : v[i][j];
            }
        }

        for(int i = 1; i <= n; ++i){
            for(int j = 1; j <= m; ++j){
                cout << v[i][j] << ' ';
            }
            cout << '\n';
        }


    }
}