-20 1000111001100101
32
0 1 -1
1 2 1
2 3 1
3 0 -1
4 5 1
5 6 1
6 7 1
7 4 -1
8 9 -1
9 10 1
10 11 -1
11 8 1
12 13 -1
13 14 1
14 15 1
15 12 -1
0 4 1
1 5 -1
2 6 -1
3 7 1
4 8 -1
5 9 1
6 10 1
7 11 -1
8 12 1
9 13 -1
10 14 -1
11 15 -1
12 0 -1
13 1 -1
14 2 1
15 3 1
