proposition: Lemma example_pick_fresh_use : forall (x y z : atom) (L1 L2 L3: atoms), True.
proof: Proof. intros x y z L1 L2 L3. pick fresh k. trivial. Qed.
imports: Coq.Arith.Arith Coq.Arith.Max Coq.Classes.EquivDec Coq.Lists.List Coq.Structures.Equalities Coq.FSets.FSets Metalib.CoqListFacts Metalib.FSetExtra Metalib.FSetWeakNotin Metalib.LibTactics Lia