<fizzie> ` rm /hackenv/bin/bfi; ln -s /hackenv/lib/kps/bfi /hackenv/bin/bfi # no need for actual copies that you can forget to delete though

|a+b@| = { √(a²-b²) if a²-b² ≥ 0 ; i√(a²-b²) if a²-b² < 0 }