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The Oregon Symphony , based in Portland , Oregon , was founded in 1896 as the Portland Symphony Society ; it is the sixth oldest orchestra in the United States ( and the oldest in the Western United States ) , and claims to be one of the largest arts organizations in the Pacific Northwest .
 Oregon, Portland , Oregon, Portland, Western United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Oregon, Portland , Oregon, Portland, Western United States