∀ {α : Type} {motive_1 : Lean.Data.Trie α → Sort u} {motive_2 : Array (Lean.Data.Trie α) → Sort u}
  {motive_3 : List (Lean.Data.Trie α) → Sort u} (t : List (Lean.Data.Trie α))
  (F_1 : (t : Lean.Data.Trie α) → t.below → motive_1 t)
  (F_2 : (t : Array (Lean.Data.Trie α)) → Lean.Data.Trie.below_1 t → motive_2 t)
  (F_3 : (t : List (Lean.Data.Trie α)) → Lean.Data.Trie.below_2 t → motive_3 t),
  Lean.Data.Trie.brecOn_2 t F_1 F_2 F_3 = F_3 t (Lean.Data.Trie.brecOn_2.go t F_1 F_2 F_3).2