Compose composed with compose operator.

(f ... g) x y === f (g x y)

Compose functions with one argument with function with two arguments.
`f .: g = \x y -> f (g x y)`.

Binary composition: pass two args to the right argument before
composing.
`(f .) . g` but more
easily extended to multiple uses, due to the fixity declaration.

(f .: g) x y = f (g x y)or,

f .: g = curry (f . uncurry g)This is the same as the common idiom

Multivariant composition.

f .: g ≡ (f .) . g ≡ \c d -> f (g c d)

Wrap the result of a function applied to 2 arguments.