15474
Once this was experimentally confirmed and announced by  Joliot-Curie  in 1939 scientists in many countries ( including the United States the United Kingdom  France  Germany and the Soviet Union ) petitioned their governments for support of nuclear fission research just on the cusp of World War II for the development of a nuclear weapon .
 countries of residence: Joliot-Curie, France
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:
 countries of residence: Joliot-Curie, France