{I₁ : Type u_1} →
  {I₂ : Type u_2} →
    {I₁₂ : Type u_4} →
      (c₁ : ComplexShape I₁) →
        (c₂ : ComplexShape I₂) → (c₁₂ : ComplexShape I₁₂) → [self : TotalComplexShape c₁ c₂ c₁₂] → I₁ × I₂ → I₁₂