fact: Fixpoint ill_has_bot f := match f with | ill_var _ => False | ill_cst ill_bot => True | ill_ban f => ill_has_bot f | ill_bin _ f g => ill_has_bot f \/ ill_has_bot g | _ => False end.
imports: List Permutation Undecidability.Shared.Libs.DLW(utils) Undecidability.ILL(ILL CLL)