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Rashid ad-Din Sinan , the leader of the Ismaili sect in Syria , used this castle initially as his base and hermitage .
 Rashid ad-Din Sinan, Ismaili, Syria
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rashid ad-Din Sinan, Ismaili, Syria