∀ (k₁ : ℤ) (m₁ : Lean.Grind.CommRing.Mon) (c₁ : Lean.Meta.Grind.Arith.CommRing.EqCnstr) (k₂ : ℤ)
  (m₂ : Lean.Grind.CommRing.Mon) (c₂ : Lean.Meta.Grind.Arith.CommRing.EqCnstr),
  sizeOf (Lean.Meta.Grind.Arith.CommRing.EqCnstrProof.superpose k₁ m₁ c₁ k₂ m₂ c₂) =
    1 + sizeOf k₁ + sizeOf m₁ + sizeOf c₁ + sizeOf k₂ + sizeOf m₂ + sizeOf c₂