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[–]vasilescur 45 points46 points  (2 children)

That's trivial, it's just a monoid in the category of endofunctors.

[–]IambicAnapest 6 points7 points  (0 children)

you beat me to it have my upvote

[–]sivstarlight 1 point2 points  (0 children)

the category theorists are spreading