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Sep 14th, 2018
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  1. building a nested set
  2. A
  3. | | | |
  4. B C D E
  5. |
  6. ------------
  7. | | | |
  8. F G H J
  9. |
  10. ----------
  11. | | | |
  12. W X Y Z
  13.  
  14. A brings A B C D
  15. E then brings F G H J
  16. F brings WXYZ
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