8874
Shell Aircraft International based at Rotterdam Airport operates aircraft for  Royal Dutch Shell  headquarters and for two Shell group operating companies  Shell Oil Company  in the USA and Shell Canada Limited .
 subsidiaries: Royal Dutch Shell, Shell Oil Company
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:
 subsidiaries: Royal Dutch Shell, Shell Oil Company