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BOOLEAN OPERATORS 



The Boolean operators AND and OR are the most conoaon but there are 

 many more. CSG recommends that users limit themselves to AND and OR, 

 but some of the other possibilities arei BOTH, NOR, and NOT. 



"AND" generally means that both the first AND the second argument 

 must be present for the data to show up. "AND" thus usually results 

 in smaller sets of data. 



"OR" generally means that either the first OR the second argument 

 needs to be present for the data to show up. "OR" thus usually 

 results in larger sets of data. 



Sometimes operators can be combined. For example, AND NOT means to 

 look for the first term, but not the second term. 



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