Describe briefly different techniques of Boolean search.
Boolean search is a powerful technique used in information retrieval systems to refine and narrow down search results by specifying logical relationships between keywords. There are several key Boolean operators and techniques that can be employed to enhance search queries:
1. AND Operator: This operator narrows down search results by requiring that all specified keywords must be present in the retrieved documents. For example, "cat AND dog" will only _______ ____ _______ ________ __________.
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