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They also point to the areas growing population as needing new stores and a plan by the state of Massachusetts to complete the widening of Route 9 from Northampton to the Amherst border as a solution to traffic jams .
 Massachusetts
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Massachusetts