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The Lowell National Historical Park provides a free streetcar shuttle between its various sites in the city center , using track formerly used to provide freight access to the city 's mills .
 location: Lowell National Historical Park
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Lowell National Historical Park