Paul Johnson <paul at cogito.org.uk> writes: > See http://okmij.org/ftp/Haskell/perfect-shuffle.txt I should have read that first time round! -- Jón Fairbairn Jon.Fairbairn at cl.cam.ac.uk http://www.chaos.org.uk/~jf/Stuff-I-dont-want.html (updated 2009-01-31)