00|       |       7| |Item0
01|      0|       1| |Item1
02|      1|        | |Item2
01|      0|        | |Item3
00|       |        | |Item4

Level 0 parents and items = 2
0:1|3|
4:

Level 1 parents = 1

0|5
0:7|2
1:11|1
