reference
stringclasses 4
values | answer
stringclasses 4
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|---|---|
C
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D
|
D
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A
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C
|
A
|
D
|
D
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A
|
A
|
D
|
A
|
B
|
A
|
D
|
A
|
B
|
A
|
C
|
D
|
C
|
A
|
C
|
A
|
A
|
A
|
B
|
A
|
C
|
B
|
A
|
A
|
A
|
A
|
C
|
A
|
B
|
D
|
A
|
A
|
D
|
A
|
B
|
B
|
B
|
A
|
C
|
B
|
C
|
B
|
C
|
C
|
C
|
C
|
B
|
A
|
A
|
A
|
A
|
B
|
A
|
A
|
B
|
B
|
A
|
A
|
A
|
A
|
B
|
A
|
B
|
B
|
C
|
C
|
C
|
B
|
C
|
A
|
B
|
A
|
C
|
A
|
C
|
A
|
C
|
C
|
C
|
D
|
B
|
B
|
C
|
A
|
B
|
C
|
B
|
B
|
C
|
A
|
A
|
B
|
C
|
C
|
A
|
B
|
A
|
D
|
B
|
B
|
B
|
B
|
C
|
B
|
B
|
B
|
C
|
B
|
B
|
B
|
B
|
B
|
C
|
B
|
B
|
B
|
C
|
C
|
B
|
B
|
C
|
C
|
B
|
A
|
A
|
A
|
B
|
B
|
A
|
A
|
B
|
B
|
B
|
B
|
A
|
B
|
C
|
C
|
B
|
D
|
B
|
B
|
C
|
B
|
C
|
B
|
C
|
C
|
C
|
A
|
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