74
The next year it merged with the engine and automotive company  Armstrong Siddeley  and its subsidiary  Armstrong Whitworth  Aircraft to form Hawker Siddeley Aircraft .
 Armstrong Siddeley, Armstrong Whitworth
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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:
 Armstrong Siddeley, Armstrong Whitworth