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The next definitive historical treatise on the common law is " Commentaries on the Laws of England " , written by Sir William Blackstone and first published in 1765 – 1769 .
 person: William Blackstone
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: William Blackstone 
Answer:
 person: William Blackstone