9643
Mark Klein is a former technician who leaked knowledge of his company's cooperation with the  United States   National Security Agency  in installing network hardware to monitor and process American telecommunications .
 United States, National Security Agency
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:
 United States, National Security Agency