∀ {α : Type u_1} {σ : Type u_2} (M : εNFA α σ) {s₁ s₂ : σ}
  (motive : (∃ n, M.IsPath s₁ s₂ (List.replicate n none)) → Prop) (h : ∃ n, M.IsPath s₁ s₂ (List.replicate n none)),
  (∀ (n : ℕ) (h : M.IsPath s₁ s₂ (List.replicate n none)), motive ⋯) → motive h