/* Jume 15, 1998 */
/* program to display a sequence of numbers using nested loop */

main ()
{
	/* declarations */
	int i, j;

	/* display numbers = top half */
        for (i = 0; i < 6; ++i)
        {
                for (j = 0; j<i; ++j)
                        printf("%2d", j);
                printf("\n");  
        }

	/* display numbers = bottom half */
	for (i = 4; i > 0; --i)	
	{
		for (j = 0; j<i; ++j)
                      	printf("%2d", j);
		printf("\n");
	}

}