R
N
N
O
D
X
O
D
X
D
D
X
O
R
D
N
X
R
D
R
R
R
X
O
X
D
X
X
X
N
O
R
O
R
D
D
N
O
N
D
D
X
X
R
X
D
O
O
D
X
D
X
R
O
N
R
N
O
O
R
N
X
N
N
N
R
O
N
N
R
O
D
N
O