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Ran Raz is well known for his work on interactive proof system s. His two most-cited papers are on multi-prover interactive proof s and on probabilistically checkable proof s. Ran Raz received Erdős Prize is 2002 .
 Ran Raz, Ran Raz
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ran Raz, Ran Raz