fact: Definition hor_compose {C : predoublecategory_hor_precat_data} { a b c : C } : a -h-> b -> b -h-> c -> a -h-> c := pr2 (pr2 C) a b c.
imports: UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.MoreFoundations.Notations UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.CategoryTheory.TwoSidedDisplayedCats.Univalence