fact: Definition conat_graph : graph := make_graph nat (λ m n, S n = m).
imports: UniMath.Foundations.PartA UniMath.CategoryTheory.Core.Categories UniMath.Foundations.NaturalNumbers UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Limits.Graphs.Colimits UniMath.CategoryTheory.Limits.Graphs.Limits UniMath.CategoryTheory.Limits.Terminal