10820
The current multi-level value-added sales tax system of  Canada  was introduced in 1991 by Prime Minister  Brian Mulroney  .
 employee of: Canada, Brian Mulroney
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  Canada, Brian Mulroney 
Answer:
 employee of: Canada, Brian Mulroney