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| puzzle one's brain about a problem (one's head over a question, oneself over the matter, etc., и т.д.); puzzle one's brain upon a problem (one's head over a question, oneself over the matter, etc., и т.д.) | |||
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| puzzle one's brain about a problem (one's head over a question, oneself over the matter, etc., и т.д.); puzzle one's brain upon a problem (one's head over a question, oneself over the matter, etc., и т.д.) | |||