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