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a difficult problem

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set a riddle

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explain a riddle

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speak in riddles

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pierce many times

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separate with a riddle, as grain from chaff

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a canon in which the entrances of successive parts were indicated by cryptic symbols and devices (popular in the 15th and 16th centuries)

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(often followed by `with') damaged throughout by numerous perforations or holes

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spread throughout

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a journey in a vehicle driven by someone else

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a mechanical device that you ride for amusement or excitement

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harass with persistent criticism or carping