Module fc_dec_aux (wf : fc_wf_sig) (weak : fc_weak_sig) (subst : fc_subst_sig) (unique: fc_unique_sig).
(**** Decision procedures for a few auxiliary relations ****)

Lemma binds_dec_cs : forall x G, {C | binds x (Cs  C) G} + {(forall C, ¬ binds x (Cs  C) G)}.