单项选择题
A."OEHN" B."EHN" C."IO" D."IOEHN"
A.[1,3,4] B.[2,3,4] C.[0,3,4] D.[2,3,5]
A.0 B.1 C.2 D.3
A."python" B."great" C."pythongreat" D.""
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