(n : ℕ) →
  (motive : Affine.Simplex.PointsWithCircumcenterIndex (n + 2) → Sort u_1) →
    (x : Affine.Simplex.PointsWithCircumcenterIndex (n + 2)) →
      ((a : Fin (n + 2 + 1)) → motive (Affine.Simplex.PointsWithCircumcenterIndex.pointIndex a)) →
        (Unit → motive Affine.Simplex.PointsWithCircumcenterIndex.circumcenterIndex) → motive x