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