∀ {A : Type u₁} {B : Type u₂} {C : Type u₃} {inst : CategoryTheory.Category.{v₁, u₁} A}
  {inst_1 : CategoryTheory.Category.{v₂, u₂} B} {inst_2 : CategoryTheory.Category.{v₃, u₃} C}
  {F : CategoryTheory.Functor A B} {G : CategoryTheory.Functor C B} {X : Type u₄}
  {inst_3 : CategoryTheory.Category.{v₄, u₄} X} {x y : CategoryTheory.Limits.CategoricalPullback.CatCommSqOver F G X}
  {x_1 y_1 : CategoryTheory.Limits.CategoricalPullback.CatCommSqOver.Hom X x y},
  x_1 = y_1 ↔ x_1.fst = y_1.fst ∧ x_1.snd = y_1.snd