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Boolean and proximity queries allow you to provide specific search criteria that define the relationship between different search terms. You use Boolean and proximity operators to specify terms that must or must not occur, and the relationship between those terms.
Generally basic search provides the available results on a subject. You can use Boolean and proximity operators to define a more explicit search.
For legal searches you might require more explicit control about the terms that the search includes or excludes.
You might also use Boolean and proximity operators as part of a more advanced search to tailor the results.