A T
A T
A T
T
T
A A A A
0
0
0
0 A
A
A
A A
A
A
A
A A
B F
B F
B F
F
F
B B B B
1
1
1
1 B
B
B
B B
B
B
B
B B
E F
E F
E E E E
4
E F
E F
D D D D D D
3 D
D C
C
C C
C
C
C
C
C
C C C C
2
2
2
2 C
C
C
C
A A
A A
A A
A
A
A
A
A
A A A A
A
A
A B B
B B
B B
B
B
B
B
B
B B B B
B
B
B
E E E
D D D
C
C D
C
C D
C
C D
C D
C D
C
C
C
C C C C
C
C
C
N