fact: Definition reverse_binopfun (X : hSet) : binopfun (free_monoid X) (setwithbinop_rev (free_monoid X)).
imports: UniMath.MoreFoundations.Subtypes UniMath.MoreFoundations.Sets UniMath.Algebra.Monoids UniMath.Algebra.Groups UniMath.Algebra.IteratedBinaryOperations UniMath.Combinatorics.Lists