Hello Benjamin, Saturday, March 11, 2006, 1:49:10 AM, you wrote: BF> http://www.mail-archive.com/haskell%40haskell.org/msg17081.html to be exact, i implemented Oleg's idea and published this in Feb in haskell list. now i work on integrating this code with the Data.Array.* library -- Best regards, Bulat mailto:Bulat.Ziganshin at gmail.com