fact: Fixpoint dp_par_list p := match p with | dp_nat _ => nil | dp_var _ => nil | dp_par x => x::nil | dp_comp _ p q => dp_par_list p ++ dp_par_list q end.
imports: List Arith Lia  Undecidability.Shared.Libs.DLW(utils_tac utils_list sums pos vec) Undecidability.H10.Dio(dio_logic dio_elem)