/* Binary.c */
#include <stdio.h>

main()
{
  int i,j,k,l;
  printf(" i j k l\n");
  for (i = 0; i <= 1; i++)
    for (j = 0; j <= 1; j++)
      for (k = 0; k <= 1; k++)
        for (l = 0; l <= 1; l++)
          printf("%2d%2d%2d%2d\n", i, j, k, l);
  return 0;
}