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authorJoe Zhao <ztuowen@gmail.com>2015-03-31 23:41:55 +0800
committerJoe Zhao <ztuowen@gmail.com>2015-03-31 23:41:55 +0800
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rename to H**, +31 +32 +33 +34 +35 +36
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+import Control.Applicative
+
+dupli :: [a] -> [a]
+dupli = concatMap (replicate 2)
+
+dupli' xs = concat [ [x,x] | x <- xs ]
+
+dupli'' = (<**> [id,id])
+
+dupli''' = foldr ((.) <$> (:) <*> (:)) []