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 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:  Shapley, Princeton University 
Answer:
 employee of: Shapley, Princeton University