1 0
2 [2, 11]
2 1
3 [3, 12]
3 [2, 11]
3 2
4 [3, 12]
4 [2, 11]
4 2
5 [3, 12]
5 [2, 11]
5 2
6 [3, 12]
6 [2, 11]
6 [6, 9]
6 3
7 [3, 12]
7 [2, 11]
7 [6, 9]
7 3
8 [3, 12]
8 [2, 11]
8 [6, 9]
8 3
9 [3, 12]
9 [2, 11]
9 [6, 9]
9 3
10 [3, 12]
10 [2, 11]
10 2
11 [3, 12]
11 [2, 11]
11 2
12 [3, 12]
12 [12, 15]
12 2
13 [12, 15]
13 1
14 [12, 15]
14 1
15 [12, 15]
15 1
16 0
17 [17, 18]
17 1
3