ICFP 2007 Contest: https://web.archive.org/web/20090301164728/https://save-endo.cs.uu.nl/
at main 85 B view raw
1(?{IFPCFFP})n{0,24} ; {0}n{42,24} ; 2(?{IFPICFPPCFFPP}!{0x503})n{0,24} ; {0}n{6,24} ;