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Shim ` on ben Yeshu ` a ben Sira is not to be confused with his grandfather , Ben Sira , but this article will refer to him simply as Ben Sira for convenience .
 Sira, Ben Sira, Ben Sira
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sira, Ben Sira, Ben Sira