∀ {α : Type w} {m : Type w → Type w'} {β : Type w} [inst : Std.Iterator α m β],
  Std.IterM.TerminationMeasures.Productive.Rel =
    Relation.TransGen (InvImage Std.IterM.IsPlausibleSkipSuccessorOf Std.IterM.TerminationMeasures.Productive.it)