15094
Post-graduation  Shapley  received a fellowship to  Princeton University  for graduate work where he studied under Henry Norris Russell and used the period-luminosity relation for Cepheid variable stars ( discovered by Henrietta Swan Leavitt ) to determine distances to globular clusters .
 employee of: Shapley, Princeton University
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:
 employee of: Shapley, Princeton University