∀ {α : Type u} {σ : Type v} {M : εNFA α σ} {S : Set σ} {motive : (a : σ) → M.εClosure S a → Prop} {a : σ}
  (t : M.εClosure S a),
  (∀ (s : σ) (a : s ∈ S), motive s ⋯) →
    (∀ (s t : σ) (a : t ∈ M.step s none) (a_1 : M.εClosure S s), motive s a_1 → motive t ⋯) → motive a t