1. 26.
    0
    up up up up up up up up up up
    ···
  2. 27.
    0
    up up up up up up up up up up up up up up up up up up up up up up up up up up up up up up
    ···
  3. 28.
    0
    up up up up up up up up up up up up up up up up up up up up
    ···