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The Portland Penny is the name subsequently given to a specific coin , a U.S. copper one-cent piece , used to decide the name of Portland , Oregon , United States .
 Portland, Portland , Oregon, 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:
 Portland, Portland , Oregon, United States