多项选择题
Which two statements are true?()
A.The output could be 8-1,7-2,8-2,7-1
B.The output could be 7-1,7-2,8-1,6-1
C.The output could be 8-1,7-1,7-2,8-2
D.The output could be 8-1,8-2,7-1,7-2
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