fact: Definition wfpb_weight wfpb := match wfpb with | W pb _ => pb_weight pb end.
imports: Coq(Arith List Wellfounded Wf_nat) CoLoR(more_list list_permut list_sort term_spec term_o equational_theory ac matching dickson matching_well_formed matching_well_founded matching_sound matching_complete dickson)