8923
 Larger than even the Amazon , North America 's boreal zone is one of the biggest intact ecosystems left on the planet , with 1.4 billion acres in Canada alone , most of it still in immense , interlocking tracts that make up a quarter of the earth 's remaining original forest . 
 location contains: North America, Canada
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 location contains: North America, Canada