∀ {I : Type u} (C : Set (I → Bool)) [inst : LinearOrder I] [inst_1 : WellFoundedLT I] {o : Ordinal.{u}}
  (ho : o < Ordinal.type fun x1 x2 => x1 < x2),
  Profinite.NobelingProof.contained
    (Profinite.NobelingProof.π (Profinite.NobelingProof.C1 C ho) fun x => Profinite.NobelingProof.ord I x < o) o