4`unsplit` is an arrow that takes a pair of values and combines them to
7``` {.haskell .literate}
8unsplit :: (Arrow a) => (b -> c -> d) -> a (b, c) d
10 -- arr (\op (x,y) -> x `op` y)
13`(***)` combines two arrows into a new arrow by running the two arrows on a
14pair of values (one arrow on the first item of the pair and one arrow on the
15second item of the pair).
17 f *** g = first f >>> second g
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