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