-20 0010110010101010
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
