#include <bits/stdc++.h>
using namespace std;

int main() {
	int T; cin >> T;
	while (T--) {
		int H, W; cin >> H >> W;
		if (H == 3 && W == 3) {
			cout << "No\n";
			continue;
		}
		cout << "Yes\n";
		for (int i = 0; i < H; i++) {
			cout << string(W, '1') << '\n';
		}
	}
}