1. 276.
    0
    up up up up up
    ···
  2. 277.
    0
    up up upu up
    ···
  3. 278.
    0
    up up up up p
    ···
  4. 279.
    0
    up up up up up
    ···
  5. 280.
    0
    up up up up up up
    ···
  6. 281.
    0
    up up up upu p
    ···
  7. 282.
    0
    up up up up up up
    ···
  8. 283.
    0
    up up up up
    ···
  9. 284.
    0
    up up up up up
    ···
  10. 285.
    0
    up up up up up
    ···
  11. 286.
    0
    up up up up up
    ···