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An application of the Ramanujan conjecture is the explicit construction of Ramanujan graphs by Lubotzky , Phillips and Sarnak .
 person: Ramanujan; person: Lubotzky; person: Phillips; person: Sarnak
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Ramanujan; person: Lubotzky; person: Phillips; person: Sarnak