val (<<) : ('a -> 'b) -> ('c -> 'a) -> ('c -> 'b)
f << g function composition: (f << g) x = f (g x) and f << g << h
equals (f << g) << h
val (>>) : ('a -> 'b) -> ('b -> 'c) -> ('a -> 'c)
f >> g function composition: (f >> g) x = g (f x). This operator is
left associative: f >> g >> h equals (f >> g) >> h.
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