439
At RAF  Uxbridge  AOC No. 11 Group RAF  Keith Park  and his controllers directed No. 501 Squadron RAF and its 12 Hawker Hurricanes already in the air to Canterbury at feet .
 top members employees: Uxbridge, Keith Park
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:
 top members employees: Uxbridge, Keith Park