Hi I have read in one tutorial (I can't find it again, but it was probably either one on ibm, gentle introduction or yaht), that it is possible to define relationships between free variables and the same program can be used to calculate either first variable when second is set or second when first is set. I have understood this as if I set first free variable, run program and write name of second variable and I get result, and vice versa. I don't know if I understood it well. It looks really interesting but I can't figure out how to do it. Is this really possible? (I doubt.) If yes show example please. Thanks Fero -- View this message in context: http://www.nabble.com/Interesting-feature-tp18311432p18311432.html Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.