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