644
The riding of Calgary Centre has been vacant since May 30 2012 when Lee Richardson resigned to accept a position as principal secretary to  Alberta  Premier  Alison Redford  .
 Alberta, Alison Redford
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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} 
Answer:
 Alberta, Alison Redford