∀ {α : Type u_1} (p p_1 : α → Prop),
  p = p_1 →
    ∀ {inst : DecidablePred p} [inst_1 : DecidablePred p_1] (l l_1 : FreeMonoid α),
      l = l_1 → FreeMonoid.countP' p l = FreeMonoid.countP' p_1 l_1