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Built on the indexed database
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Basic functions/algorithms - keyword-based search
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logical operators (and, or, not)
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regular expressions (wildcard)
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ranking of query results
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case sensitive/insensitive
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Advanced functions - concept-based search
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summarize - generate a summary of a document using natural language processing techniques
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similarity search - search similar documents to a particular document
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phrase search
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proximity search - specify words distance between keywords
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