1. 51.
    0
    up up up up
    ···
  2. 52.
    0
    up up up up
    ···
  3. 53.
    0
    up up up up up up
    ···
  4. 54.
    0
    up up up up up up up upupuupuıp
    ···
  5. 55.
    0
    up up up up up up up up up up up
    ···