∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] {X₁₁ X₁₂ X₂₂ X₃₁ X₃₂ : C} {h₁₁ : X₁₁ ⟶ X₁₂}
  {h₃₁ : X₃₁ ⟶ X₃₂} {v₃₁ : X₁₁ ⟶ X₃₁} {v₁₂ : X₁₂ ⟶ X₂₂} {v₂₂ : X₂₂ ⟶ X₃₂},
  CategoryTheory.IsPullback h₁₁ v₃₁ (CategoryTheory.CategoryStruct.comp v₁₂ v₂₂) h₃₁ →
    CategoryTheory.CategoryStruct.comp (CategoryTheory.CategoryStruct.comp h₁₁ v₁₂) v₂₂ =
      CategoryTheory.CategoryStruct.comp v₃₁ h₃₁