B
A
N
N
H
H
N
N
N
N
N
H
N
H
N
N
N
N
H
D
A
A
N
N
H
B
B
B
N
B
D
N
A
D
H
H
N
N
N
A
N
A
N
N
N
N
N
H
H
B
N
A
H
A
B
A
N
H
A
D
H
B