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a/src/rcldb/rcldoc.cpp b/src/rcldb/rcldoc.cpp
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    const string Doc::keyrr("relevancyrating");
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    const string Doc::keyrr("relevancyrating");
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    const string Doc::keyabs("abstract");
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    const string Doc::keyabs("abstract");
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    const string Doc::keyau("author");
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    const string Doc::keyau("author");
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    const string Doc::keytt("title");
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    const string Doc::keytt("title");
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    const string Doc::keykw("keywords");
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    const string Doc::keykw("keywords");
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    const string Doc::keymd5("md5");
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}
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}