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4
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5
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6
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7
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8
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9
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  (3,8)
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10
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11
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  ????? ???? ???
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12
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  ??????? ??????

13
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• ????? ??? ? ????? ???
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• ??????? ?? ?????? ???? TREC ?? ????? ????? ?????

14
????? ???? ????? - ????? ???

• ?????? ?????? ????? ??? ?? ????
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15
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16
?????

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17
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