13506
Descended from the  Luxembourg  Airlines Company founded in 1948  Luxair  was set up in 1961 to meet the growing demand for air links between Luxembourg and other European cities .
 founded by: Luxembourg, Luxair
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Luxembourg, Luxair 
Answer:
 founded by: Luxembourg, Luxair