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