B
X
B
S
L
S
O
B
O
S
B
O
S
B
X
S
L
L
B
L
X
X
X
S
S
O
B
O
B
O
O
X
L
L
B
L
L
S
B
L
X
L
O
O
X
X
L
X
S
S
X
O
B
S