4872
 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: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
 Entity Pairs:  North America, Great Plains 
Answer:
 location contains: North America, Great Plains