1
B
2
A
3
C
4
D
5
B
6
B
7
B
8
C
9
10
11
D
12
A
13
B
14
B
15
B
16
C
17
B
18
D
19
D
20
D
21
D
22
23
A
24
A
25
D
26
C
27
D
28
29
C
30
C
31
A
32
C
33
34
C
35
36
C
37
B
38
D
39
B
40
41
4
42
D
43
C
44
45
A
46
C
47
B
48
B
49
A
50
A
51
C
52
B
53
C
54
D
55
C
56
C
57
B
58
C
59
A
60
B
61
C
62
A
63
64
A
65
A
66
A
67
D
68
B
69
C
70
D
71
72
A
73
B
74
B
75
C
76
C
77
B
78
C
79
A
80
A
this answer 4 which set(a,b,c,d)
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