10230
From 1997 to 2011 the  TTC  employed Special Constables that were responsible for safety and security and had similar policing powers to  Toronto  Police Service officers .
 city of headquarters: TTC, Toronto
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: 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:
 city of headquarters: TTC, Toronto