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ACROSS
1)  a large city of central poland
2)  the content of cognition; the main thing you are thinking about
3)  an average of n numbers computed by adding some function of the numbers and dividing by some function of n
4)  a southeastern suburb of paris; site of an international airport serving paris


DOWN
1)  large luxurious car; usually driven by a chauffeur
2)  a european river; flows into the baltic sea
3)  a particular instance of buying or selling
4)  a buffoon in one of the old comedies; imitates others for ludicrous effect

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