Lemma assoc4 (C : precategory) (a b c d e : C) (f : a --> b) (g : b --> c) (h : c --> d) (i : d --> e) : ((f · g) · h) · i = f · (g · h) · i. Proof. repeat rewrite assoc; apply idpath. Qed.
Require Import UniMath.Foundations.Propositions. Require Import UniMath.Foundations.Sets. Require Import UniMath.MoreFoundations.PartA. Require Import UniMath.MoreFoundations.Notations.