1. 512.
    0
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    ···
  2. 511.
    0
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    ···
  3. 510.
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    ···
  4. 509.
    0
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    ···
  5. 508.
    0
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    ···
  6. 507.
    0
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    ···
  7. 506.
    0
    up up up
    ···
  8. 505.
    0
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    ···
  9. 504.
    0
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    ···
  10. 503.
    0
    up up up
    ···
  11. 502.
    0
    up up up
    ···
  12. 501.
    0
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    ···
  13. 500.
    0
    up up up
    ···
  14. 499.
    0
    up up up
    ···
  15. 498.
    0
    up up up
    ···
  16. 497.
    0
    up up up
    ···
  17. 496.
    0
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    ···
  18. 495.
    0
    up up up
    ···
  19. 494.
    0
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    ···
  20. 493.
    0
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    ···