On Saturday 14 July 2007 23:45:57 Derek Elkins wrote: > Read http://www.cs.hmc.edu/~oneill/papers/Sieve-JFP.pdf Wow, that is a really enlightening paper. :-) -- Dr Jon D Harrop, Flying Frog Consultancy Ltd. The OCaml Journal http://www.ffconsultancy.com/products/ocaml_journal/?e