//
//	name:	ForDemo2.java
//
//	P.221, #13
//


public class ForDemo2
{
	public static void main(String[] args)
	{

		int count, count2;

		for (count=0; count<=3; count++)
			for(count2=0; count2<count; count2++)
				System.out.println(count2);

		System.out.println("\n\nByebye");
	}
}