∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] {J : CategoryTheory.Limits.MultispanShape}
  {I : CategoryTheory.Limits.MultispanIndex J C} (K : CategoryTheory.Limits.Multicofork I) (a : J.L) {Z : C}
  (h : K.pt ⟶ Z),
  CategoryTheory.CategoryStruct.comp (I.fst a) (CategoryTheory.CategoryStruct.comp (K.π (J.fst a)) h) =
    CategoryTheory.CategoryStruct.comp (I.snd a) (CategoryTheory.CategoryStruct.comp (K.π (J.snd a)) h)