proposition: Lemma wf_empty : wf empty.
proof: Proof. split. apply wf_map_empty. apply IntMapForallEmpty. Qed.
imports: Cdcl.PatriciaR Cdcl.KeyInt Cdcl.ReifClasses Cdcl.Lib Bool Setoid ZifyBool ZArith Uint63 Lia List Cdcl.Syntax Cdcl.Clause