proposition: Lemma is_precategory_pregraph : is_precategory pregraph_precategory_data.
proof: Proof. apply is_precategory_one_assoc_to_two. repeat apply make_dirprod; cbn. - exact @graph_mor_id_left. - exact @graph_mor_id_right. - apply @graph_mor_comp_assoc. Qed.
imports: UniMath.Foundations.PartB UniMath.CategoryTheory.Core.Categories UniMath.Combinatorics.Graph