∀ {α : Type u_1} (motive : (x : ℕ) → (Fin x → α) → Prop) (x : ℕ) (x_1 : Fin x → α),
  (∀ (x : Fin 0 → α), motive 0 x) →
    (∀ (a : Fin 1 → α), motive 1 a) → (∀ (n : ℕ) (a : Fin (n + 2) → α), motive n.succ.succ a) → motive x x_1