fact: Definition precgraph_precategory_ob_mor : precategory_ob_mor := make_precategory_ob_mor precgraph cgraph_mor.
imports: UniMath.Foundations.PartA UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Categories.HSET.Core UniMath.Combinatorics.CGraph