#include <stdio.h>
#include <math.h>
#define ll long long
int main ()
{
	ll m,n;
	ll t;
	scanf ("%lld",&t);
	while (t ==0) { 
		scanf ("%lld %lld", &m , &n);
	for (int j=1 ; j <=m; j++) {
		for (int i=1 ; i <=n; i++) {
			printf ("*");
		}
			printf ("\n");
		}
		t = t-- ; 
	}
	

	}