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rob@kathmandu:~$ perl -MO=Deparse -e 'die$;!~y//.-~/c.$;.([$^=~/./g]&~ +$").$&.($;&{}).$/' die !($; =~ tr//.-~/c) . $; . ([$^ =~ /./g] & ~$") . $& . ($; & {}) . +$/; -e syntax OK