{C : Type u₂} →
  [inst : CategoryTheory.Category.{v₂, u₂} C] →
    {D : Type u₃} →
      [inst_1 : CategoryTheory.Category.{v₃, u₃} D] →
        {E : Type u₄} →
          [inst_2 : CategoryTheory.Category.{v₄, u₄} E] →
            CategoryTheory.Cat.of (CategoryTheory.Functor C (CategoryTheory.Functor D E)) ≅
              CategoryTheory.Cat.of (CategoryTheory.Functor (C × D) E)