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con mem :: K --> Name -> K -> {K} -> Type
val mem : K --> nm :: Name -> t :: K -> r :: {K} -> [[nm] ~ r] => mem nm t ([nm = t] ++ r)
val mp : K --> K2 --> f :: (K -> K2) -> nm ::: Name -> t ::: K -> r ::: {K} -> mem nm t r -> mem nm (f t) (map f r)
val proj : nm ::: Name -> t ::: Type -> r ::: {Type} -> mem nm t r -> $r -> t
val replace : nm ::: Name -> t ::: Type -> r ::: {Type} -> mem nm t r -> $r -> t -> $r
val fold : K --> tf :: ({K} -> Type) -> r ::: {K}
-> (nm :: Name -> v :: K -> r' :: {K} -> [[nm] ~ r']
=> mem nm v r -> tf r' -> tf ([nm = v] ++ r'))
-> tf []
-> folder r -> tf r
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