B
0
2
B
0
2
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
1
B
0
2
B
0
4