THERE HAD BEEN16 A A B A 17 C B A D 18 D D D C 19 D B...
50:
there had been16
A
A
B
A
17
C
B
A
D
18
D
D
D
C
19
D
B
A
C
20
B
B
C
C
21
B
D
C
B
22
C
A
C
B
23
B
D
C
A
24
D
C
D
C
25
A
C
C
C
26
D
C
D
C
27
D
C
C
C
28
B
C
D
B
29
C
C
B
D
30
C
A
D
B
31
C
D
D
B
32
B
D
B
A
33
C
A
C
A
34
A
B
B
A
35
D
B
A
C
36
D
A
D
A
37
C
D
B
D
38
B
A
A
A
39
A
C
A
C
40
A
B
C
B