∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.Abelian C]
  (S : CategoryTheory.ShortComplex.SnakeInput C),
  CategoryTheory.ShortComplex.opMap (CategoryTheory.CategoryStruct.comp S.v₁₂ S.v₂₃) =
    CategoryTheory.ShortComplex.opMap 0