15052
The Spitfire was designed as a short-range high-performance interceptor aircraft by  R. J. Mitchell  chief designer at  Supermarine  Aviation Works ( which operated as a subsidiary of Vickers-Armstrong from 1928 ) .
 top members employees: R. J. Mitchell, Supermarine
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: R. J. Mitchell, Supermarine