#include<bits/stdc++.h>
using namespace std;
const int N=1010;
int a[N][N];

void solve() {
    int n, m;
    cin >> n >> m;
    if(n <= 3 && m <= 3) {
        cout << n * m << "\n";
        for(int i = 1; i <= n; ++i) {
            for(int j = 1; j <= m; ++j) {
                cout << "1";
            }
            cout << "\n";
        }
        return ;
    }
    int ans = 0;
    for(int i = 1; i <= n; ++i) for(int j = 1; j <= m; ++j) ans += a[i][j];
    int flg = 0;
    if(n % 4 == 1 && m % 4 == 1) flg = 1;
    cout << ans - flg << "\n";
    for(int i = 1; i <= n; ++i) {
        for(int j = 1; j <= m; ++j) {
            if(i == n && j == m) {
                if(flg) cout << "0";
                else cout << a[i][j];   
            } else {
                cout << a[i][j];
            }
        }
        cout << "\n";
    }
}

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    for(int i = 1; i <= 1000; i += 4) {
        for(int j = 1; j <= 1000; j += 4) {
            for(int o : {0, 1, 2}) a[i][j + o] = 1;

            for(int o : {0, 2, 3}) a[i + 1][j + o] = 1;

            for(int o : {0, 1, 3}) a[i + 2][j + o] = 1;

            for(int o : {1, 2, 3}) a[i + 3][j + o] = 1;
        }
    }
    int T;
    cin >> T;
    for(int o = 1; o <= T; ++o) {
        solve();
    }
}

/*

11101110111
10111011101
11011101110
01110111011
11101110111
10111011101
11011101110
01110111011
11101110111
10111011101
11011101110


*/