27650
The golden era of North America , in the eyes of today 's North Americans , was about 200 years ago , when bison roamed the Great Plains by the millions .
 location contains: North America, Great Plains
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:  North America, Great Plains 
Answer:
 location contains: North America, Great Plains