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Salem is located in the north-central Willamette Valley , in Marion and Polk counties .
 location: Salem; location: Willamette Valley; location: Marion; location: Polk
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: Salem, Willamette Valley, Marion, Polk 
Answer:
 location: Salem; location: Willamette Valley; location: Marion; location: Polk