Tree 3    Level 1

 Tree1   02        03
    \    |         |
    04  05  06 07  08 09
      \ /  /   |   | /
   10-11  12   13-14
  /     \ |   /     \
15    16-17 18  19  20-21
          \ |   /
   22-23   01-24    25-26
        \  / \     /
27-28-29-30   31-32
        / |   |    \
   33-34  35  36    37
      |    \  | \
      38   39 40 41
              |
              42

Level 2

   02 03 04
     \ | /
05-06-07      08-09
      |      /
      01-10-11
     /| \
12-13 14 15
     /|    \
17-18 19    20
   |  | \
   21 22 23

Level 3

02  03-04
  \ /
   01
  /|
05 06
