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