1. 1.
    +1 -3
    up up up
    ···
  2. 2.
    +1 -3
    up up up
    ···
  3. 3.
    0
    up up up
    ···
  4. 4.
    0
    up up upup
    ···
  5. 5.
    0
    up up up up
    ···
  6. 6.
    0
    up up up up
    ···
  7. 7.
    0
    up up up up
    ···
  8. 8.
    0
    up up up up
    ···