∀ {α : Type} [inst : DecidableEq α] [inst_1 : Hashable α] (aig : Std.Sat.AIG α),
  aig.relabelNat' =
    (Std.Sat.AIG.relabel
        (fun x =>
          match (Std.Sat.AIG.RelabelNat.State.ofAIG aig)[x]? with
          | some var => var
          | none => 0)
        aig,
      Std.Sat.AIG.RelabelNat.State.ofAIG aig)