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Held in Las Vegas , Nevada at the Rio All Suite Hotel and Casino , the 2008 series began on May 30 and featured 55 poker championships in several variants .
 location: Las Vegas , Nevada
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Las Vegas , Nevada 
Answer:
 location: Las Vegas , Nevada