Parent Directory	17	3
13b	14	12b
6b	9	2
3b	16b	8b
13	11b	16
9b	19	18b
7b	1b	19b
5	6	14b
2b	20b	12
11	5b	4b
10b	8	20
10	7	15
17b	1	4
18	15b