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The New Charles River Run is an annual running event consisting of three simultaneous races , 5 km , 7.5 miles and 7.5 mile relay , which takes place in Boston , Watertown and Cambridge , MA the last Sunday in June .
 Boston, Cambridge , MA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Boston, Cambridge , MA