A D A
C D
A B
D
A B C D
A
B
A
D
A
C
D
C
A
D
A
D
A
B
C
D
A
B
C
D
A B C D
A
B C D
A B C D
A B
C
D
A
B
C
D
A
B
C
D
A B C D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A B C D
A B C D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B C
D
A B C D
A
B
C
D
A
B
C D
A
B C
D
A B C D
A
B
C
D