17590
A state district judge agreed in May that while Mitchell Slough was once part of the nearby Bitterroot River , it had been transformed by the hand of man , by changes including numerous head gates that control flows , and so was exempt from the Montana stream access law .
 location contains: Montana, Bitterroot River
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:  Montana, Bitterroot River 
Answer:
 location contains: Montana, Bitterroot River