content: package v004;
  import java.io.BufferedReader;
  import java.io.FileReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.PrintWriter;
  import java.util.StringTokenizer;
   
   
  public class TriangleWave_UVa488 {
  	
  	public static void main(String[] args) throws IOException {
  		Scanner sc = new Scanner(System.in);
  		PrintWriter out = new PrintWriter(System.out);
  		
  		int tc = sc.nextInt();
  		while(tc-->0)
  		{
  			int A = sc.nextInt(), F = sc.nextInt();
  			StringBuilder sb = new StringBuilder();
  			for(int i = 1; i <= A; ++i)
  			{
  				for(int j = 0; j < i; ++j)
  					sb.append(i);
  				sb.append("\n");
  			}
  			for(int i = A - 1; i > 0; --i)
  			{
  				for(int j = 0; j < i; ++j)
  					sb.append(i);
  				sb.append("\n");
  			}
  			String s = sb.toString();
  			while(F-->0)
  			{
  				out.printf(s);
  				if(F != 0)
  					out.println();
  			}
  			if(tc != 0)
  				out.println();
  		}
  		out.flush();
  		out.close();
  	}
  		
  	static class Scanner 
  	{
  		StringTokenizer st;
  		BufferedReader br;
   
  		public Scanner(InputStream s){	br = new BufferedReader(new InputStreamReader(s));}
  		
  		public Scanner(FileReader s){	br = new BufferedReader(s);}
   
  		public String next() throws IOException 
  		{
  			while (st == null || !st.hasMoreTokens()) 
  				st = new StringTokenizer(br.readLine());
  			return st.nextToken();
  		}
   
  		public int nextInt() throws IOException {return Integer.parseInt(next());}
   
  		public long nextLong() throws IOException {return Long.parseLong(next());}
   
  		public String nextLine() throws IOException {return br.readLine();}
   
  		public double nextDouble() throws IOException
  		{
  			return Double.parseDouble(next());
  		}
   
  		public boolean ready() throws IOException {return br.ready();}
   
   
  	}
  } 