21562
Its 388 sites include both the great wilderness parks like the Grand Canyon and Yosemite and urban ones like Lowell National Historical Park in Massachusetts , which recaptures America 's industrial revolution .
 location contains: Massachusetts, Lowell National Historical Park
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  Massachusetts, Lowell National Historical Park 
Answer:
 location contains: Massachusetts, Lowell National Historical Park