// Ross Byers
// Solution to 2006 BHCSI Mock Contest #2 Problem Parallelogram

import java.lang.*;
import java.io.*;
import java.util.*;

public class parallelogram
{
	public static void main(String[] args) throws IOException
	{
		Scanner inFile = new Scanner(new File("parallelogram.in"));
		int n = inFile.nextInt();
		for (int i = 0; i < n; i++)
		{
			int w = inFile.nextInt();
			int h = inFile.nextInt();
			for(int j = 0; j < h; j++) // Prints h lines
			{
				for(int k = 0; k < j; k++) System.out.print(" "); // Prints preceding spaces for each line
				for(int k = 0; k < w; k++) System.out.print("* "); // Prints w "* "'s
				System.out.println(); // Adds Newline
			}
			System.out.println(); // Adds extra line between cases
		}
	}
}