[Haskell] missing http://www.haskell.org/~pairwise/intro/intro.html

it was just pointed out to me that http://www.haskell.org/~pairwise/intro/intro.html is missing, which is linked from the tutorial page. I don't own that page but I'm forwarding the observation here in case someone else thinks they do... Ben -- http://www.hawaga.org.uk/ben/