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Sraffa studied in his town and graduated at the local university with a work on inflation in  Italy  during and after World War I. Notably his tutor was  Luigi Einaudi  one of the most important Italian economists and later a president of the Italian Republic .
 countries of residence: Italy, Luigi Einaudi
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: Italy, Luigi Einaudi