20
1 2
1 2
1 2
1 2
1 2
0 2
0 2
1 2
1 2
1 2
0 2
1 2
0 2
1 2
1 2
1 2
1 2
1 2
1 2
1 2
1 2
1 2
1 2
1 2
1 2
