{C : Type u_1} →
  [inst : CategoryTheory.Category.{v_1, u_1} C] →
    {W : CategoryTheory.MorphismProperty C} →
      {X Y Y' : C} → (X ⟶ Y') → (X ⟶ Y') → (X ⟶ Y') → (s : Y ⟶ Y') → W s → W.LeftFraction₃ X Y