BEGIN{n=0;a0l=2380;a0r=3368;letl=612;letr=792;}
{for (l=0;l<a0l;l+=letl) { 
 for (r=0;r<a0r;r+=letr) { n++; printf("/usr/X11R6/bin/convert -page letter+%d+%d nebula.GIF nebula.%d.gif\n",l,r,n); }}}