#include <bits/stdc++.h>
using namespace std;
void solv2() {
int n, m;
cin >> n >> m;
cout << n*m << endl;
for (int i=0; i<n; ++i) {
for (int j=0; j<m; ++j) {
int k = i|(j<<20);
cout << k << " " ;
}
cout << endl;
}
return;
}
int main() {
int t; cin >> t;
while (t--) solv2();
return 0;
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