fact: Definition precgraph_category : precategory := make_precategory precgraph_precategory_data is_precategory_precgraph.
imports: UniMath.Foundations.PartA UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Categories.HSET.Core UniMath.Combinatorics.CGraph