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The monks referred to him as Beatus ( ' Blessed ' ) Leibowitz prior to the canticle ceremony and he was called ' Saint Leibowitz ' after it ( Brians 2007 , 3 ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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