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