F
X
O
O
O
R
R
X
X
F
F
O
D
F
D
O
O
R
X
D
X
X
F
R
X
O
X
O
X
R
D
O
O
X
R
R
D
R
F
R
X
D
X
D
O
D
D
F
X
O
R
D
O
F
D
F
D
R
O
X
D
D
F
R
F
R
R
F
X
F
R
F
D
O
F