1
D
C
B
A
2
D
C
B
A
3
B
D
C
A
4
D
C
B
A
5
D
C
B
A
6
C
B
D
A
7
D
C
B
A
8
D
C
B
A
9
C
B
D
A
10
B
D
C
A
11
D
C
B
A
12
C
B
D
A
13
B
D
C
A
14
D
C
B
A
15
C
B
D
A
16
B
D
C
A
17
D
C
B
A
18
D
C
B
A
19
B
D
C
A
20
D
C
B
A