[Solved] Function double in haskell

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Here are a few hints

foldAEB2 Nil Un Conc is the identity function

foldAEB2 Nil Un Conc :: AEB2 a -> AEB2 a

Un                       :: a -> AEB2 a
\a -> Conc (Un a) (Un a) :: a -> AEB2 a

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solved Function double in haskell