Definition graph_precategory_data : precategory_data := make_precategory_data graph_precategory_ob_mor (λ G : graph, graph_mor_id G) (λ G H K : graph, graph_mor_comp).
Require Import UniMath.Foundations.PartB. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.Combinatorics.Graph.