25986
 The most extensive congestion pricing plan , in London , was pushed by an activist and populist mayor , Ken Livingstone , and overseen by a transport commissioner , Robert R. Kiley , who happens to be a former president of the Partnership for New York City and a former chairman of the Metropolitan Transportation Authority . 
 place lived: Ken Livingstone, London
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:
 place lived: Ken Livingstone, London