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        "http://www.w3.org/ns/prov#value" : [ "FeepingCreatureNovember 7, 2008 at 1:25 PMMeanwhile, for comparison, here is a straightforward mean in an imperative language (D).ReplyDeleteTwan van LaarhovenNovember 7, 2008 at 2:25 PMVery interesting idea.The after combinator has (almost) the same type as fmap, so you could make Fold an instance of Functor:> instance Functor (Fold a) where> fmap = flip afterSimilarly, your 'both' is like <*> fro" ] ,
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