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