21
0 1 2 3 2 3 6 3 7 8 2 8 8 3 12 0 0 11 18 13
58
0 1
0 2
0 3
0 4
0 5
0 6
0 7
0 8
0 9
0 10
0 11
0 12
0 13
0 14
0 15
0 16
0 17
0 18
0 19
0 20
1 19
3 5
4 12
4 13
16 18
1 12
8 13
7 18
13 16
8 17
1 10
6 12
11 15
10 13
2 16
16 17
7 11
1 7
3 12
2 10
3 4
1 8
9 19
3 18
13 14
7 10
8 18
11 13
3 15
4 10
1 15
11 12
5 12
2 9
4 18
5 7
17 18
2 8
