ID PARENT STRINGS                                            TREE
 1      0 qqqqqqqqqqqqqqqqqX                                 aaaa
 2      1 dddddddddddddX                                     |-bbb
 5      2 ddddddddddddddddddddddddddX                        | |-ee
 6      2 jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjX | `-ffff
 3      1 ffffffffffffffffffffffffffffffffffffffffX          |-ccccc
 7      3 mmmmmmmmmmmmmmmmmmmX                               | `-gggggg
 8      7 lllllllllllllllllllllllllllllllllllllX             |   |-hhh
 9      8 yyyyyyyyyyyyyyyyyyyyyyyyyyyyX                      |   | `-iiiiii
10      7 pppppppppX                                         |   `-jj
 4      1 ssssssssssX                                        `-dddddd
