{n : ℕ} →
  {P : MvPFunctor.{u} (n + 1)} →
    {motive : (a : P.last.M) → (a_1 : Fin2 n) → MvPFunctor.M.Path P a a_1 → Sort u_1} →
      {a : P.last.M} →
        {a_1 : Fin2 n} →
          (t : MvPFunctor.M.Path P a a_1) →
            ((a : P.last.M) →
                (a_2 : Fin2 n) → (t : MvPFunctor.M.Path P a a_2) → MvPFunctor.M.Path.below t → motive a a_2 t) →
              motive a a_1 t ×' MvPFunctor.M.Path.below t