b
0
1
b
0
1
b
0
1
b
0
1
b
0
1
b
0
1
B
0
4
b
0
2
b
0
3
b
0
3
b
0
2
b
0
1
b
0
2
b
0
1
B
0
2
b
0
1
b
0
1
b
0
1
b
0
2
b
0
1
b
0
1
b
0
1
b
0
1
b
0
1