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Boolean Searching

* It is possible to compose some complex search expression
using Boolean logic on this search system. To do so, use the following terms:

'' '' (Boolean AND)
''|'' (Boolean OR)
''!'' (Boolean NOT)


*Example

Busan City
  This will retrieve all records containing both keywords Busan and City.
Busan | City
  This will retrieve all records containing the keywords Busan or City, as well as those containing both.
Busan ! City
  This will retrieve all records containing the keyword Busan but not the keyword City.