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User
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Request the best quality at the lowest price
| Request the demanded quality at the lowest price
| Request the best quality at the acceptable price
| Request the torlerable quality at the lowest price
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Operator
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Offer the best quality at the acceptable price
| Offer the acceptable quality at the highest price
| Offer the tolerable quality at the lowest price
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Researcher
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provide a flexible qos management infrastructure to the operator
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