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