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