双背

0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
3
0
3
0
1
0
1
0
1
0
1
0
3
0
1
背背
0
5
0
1
0
10
0
2
0
2
0
2
0
1