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