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a/src/rcldb/rclabstract.cpp b/src/rcldb/rclabstract.cpp
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    // The terms 'array' that we partially populate with the document
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    // The terms 'array' that we partially populate with the document
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    // terms, at their positions around the search terms positions:
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    // terms, at their positions around the search terms positions:
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    map<unsigned int, string> sparseDoc;
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    map<unsigned int, string> sparseDoc;
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    // Also remember apart the search term positions so that we can list
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    // Also remember apart the search term positions so that we can list
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    // them with their snippets.
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    // them with their snippets.
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    STD_UNORDERED_SET<unsigned int> searchTermPositions;
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    std::unordered_set<unsigned int> searchTermPositions;
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    // Remember max position. Used to stop walking positions lists while 
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    // Remember max position. Used to stop walking positions lists while 
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    // populating the adjacent slots.
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    // populating the adjacent slots.
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    unsigned int maxpos = 0;
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    unsigned int maxpos = 0;
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