_Products in Hask._

Recall that Haskell has a built-in product (pair) type with constructors written:

> data (a,b) = (a,b)

Implement isomorphisms of the following type signatures by drawing diagrams and translating them into code. Explain why the functions you have constructed are isomorphisms.

(a) swap :: (a,b) -> (b,a)
(b) unit :: a -> ((),a)
(c) assoc :: (a,(b,c)) -> ((a,b),c)

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