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{-# LANGUAGE TypeFamilies #-}
module ColInference where
type family Elem c
type instance Elem [e] = e
class Col c where
isEmpty :: c -> Bool
add :: c -> Elem c -> c
headTail :: c -> (Elem c,c)
sawpOne c1 c2
= let (x,c1') = headTail c1
(y,c2') = headTail c2
in (add c1' y,add c1' x)
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