1 [1, 11]
1 1
2 [1, 11]
2 1
3 [1, 11]
3 1
4 [1, 11]
4 1
5 [1, 11]
5 [5, 5]
5 2
6 [1, 11]
6 1
7 [1, 11]
7 1
8 [8, 18]
8 [1, 11]
8 2
9 [8, 18]
9 [1, 11]
9 [9, 18]
9 3
10 [8, 18]
10 [1, 11]
10 [9, 18]
10 3
11 [8, 18]
11 [1, 11]
11 [9, 18]
11 3
12 [8, 18]
12 [9, 18]
12 2
13 [8, 18]
13 [9, 18]
13 2
14 [8, 18]
14 [9, 18]
14 2
15 [8, 18]
15 [9, 18]
15 2
16 [8, 18]
16 [9, 18]
16 2
17 [8, 18]
17 [17, 20]
17 [9, 18]
17 3
18 [8, 18]
18 [17, 20]
18 [9, 18]
18 3
19 [17, 20]
19 1
3