∀ {O : Set (ℕ →. ℕ)} {motive : (a : ℕ →. ℕ) → Nat.RecursiveIn O a → Prop} {f h : ℕ →. ℕ} (hf : Nat.RecursiveIn O f)
  (hh : Nat.RecursiveIn O h),
  Nat.RecursiveIn.below hf → motive f hf → Nat.RecursiveIn.below hh → motive h hh → Nat.RecursiveIn.below ⋯