5686
 Ken Livingstone , London 's famously loose-lipped mayor , boarded a subway train here this morning as cameras flashed , demonstrating this city 's resolve not to be cowed by the terrorist attacks that struck three trains and a bus on Thursday . '' 
 Ken Livingstone, London
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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:
 Ken Livingstone, London