{α : Type u_4} →
  {β : Type u_5} →
    {r : α → α → Prop} →
      {s : β → β → Prop} →
        {motive : InitialSeg r s → Sort u} →
          (t : InitialSeg r s) →
            ((toRelEmbedding : r ↪r s) →
                (mem_range_of_rel' : ∀ (a : α) (b : β), s b (toRelEmbedding a) → b ∈ Set.range ⇑toRelEmbedding) →
                  motive { toRelEmbedding := toRelEmbedding, mem_range_of_rel' := mem_range_of_rel' }) →
              motive t