∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] {A : Type u_4}
  [inst_1 : CategoryTheory.Category.{u_3, u_4} A] (J : CategoryTheory.GrothendieckTopology C)
  (P : CategoryTheory.Functor Cᵒᵖ A) {X : C} (S : J.Cover X) (E : CategoryTheory.Limits.Multifork (S.index P))
  (x x_1 : S.Arrow) (r : x.Relation x_1),
  CategoryTheory.CategoryStruct.comp (E.ι (S.shape.fst { fst := x, snd := x_1, r := r }))
      ((S.index P).fst { fst := x, snd := x_1, r := r }) =
    CategoryTheory.CategoryStruct.comp (E.ι (S.shape.snd { fst := x, snd := x_1, r := r }))
      ((S.index P).snd { fst := x, snd := x_1, r := r })