#! /usr/bin/gawk -f
# Last edited on 2005-12-11 06:16:42 by stolfi

BEGIN {
  # Creates a PPM image with a uniform grid of colors spanning the 
  # whole RGB cube.
  mag = 4;
  printf "P3\n";
  printf "%d %d\n", mag*4*16, mag*4*16;
  printf "%d\n", 255;
  for (ir = 0; ir < 4; ir++)
    { 
      for (kg = 0; kg <= 15; kg ++)
        { 
          for (im = 0; im < mag; im++) 
            { 
              for (jr = 0; jr < 4; jr++)
                { 
                  kr = ir*4 + jr;
                  for (kb = 0; kb <= 15; kb++)
                    { 
                      for (jm = 0; jm < mag; jm++) 
                        { printf "%s%d %d %d ", (kb == 0 ? "" : " "), 17*kr, 17*kg, 17*kb; }
                    }
                  printf "\n";
                }
            }
        }
    }
    
  fflush("/dev/stdout");
}