10187
An established brand for no-frills service in the  United Kingdom  since 2003 Stagecoach Group through subsidiary Coach USA introduced the  Megabus  brand in March 2006 .
 country of headquarters: United Kingdom, Megabus
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:
 country of headquarters: United Kingdom, Megabus