∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.Preadditive C] {X Y : C}
  (b : CategoryTheory.Limits.BinaryBicone X Y) (s : CategoryTheory.Limits.Cocone (CategoryTheory.Limits.pair X Y))
  (j : CategoryTheory.Discrete CategoryTheory.Limits.WalkingPair),
  CategoryTheory.CategoryStruct.comp (b.toCocone.ι.app j)
      (CategoryTheory.CategoryStruct.comp b.fst (CategoryTheory.Limits.BinaryCofan.inl s) +
        CategoryTheory.CategoryStruct.comp b.snd (CategoryTheory.Limits.BinaryCofan.inr s)) =
    s.ι.app j