fact: Definition presented_abgr_pr {X : hSet} (R : hrel (free_abgr X)) : monoidfun (free_abgr X) (presented_abgr X R) := monoidquotpr _.
imports: UniMath.MoreFoundations.Subtypes UniMath.MoreFoundations.Sets UniMath.Algebra.Monoids UniMath.Algebra.Groups UniMath.Algebra.IteratedBinaryOperations UniMath.Combinatorics.Lists