/* package whatever; // don't place package name! */

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

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int[][] a1 = new int[2][3];
		System.out.println(Arrays.deepToString(a1));
		
    	int[][] a2 = { {1,2}, {3,4}, {5,6} };
    	System.out.println(Arrays.deepToString(a2));
    	
    	int[][] a3 = { {1}, {2,3}, null };
    	System.out.println(Arrays.deepToString(a3));
	}
}