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Ritchie Valens ... His Greatest Hits Volume 2 is the second greatest hits compilation by Ritchie Valens .
 Ritchie Valens, Ritchie Valens
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ritchie Valens, Ritchie Valens