∀ {α : Type u_1} {p : α → α → α → Prop} {motive : (a : List α) → List.Triplewise p a → Prop} {a : α} {l : List α}
  (a_1 : List.Pairwise (p a) l) (a_2 : List.Triplewise p l),
  List.Triplewise.below a_2 → motive l a_2 → List.Triplewise.below ⋯