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Alan Neville Gent ( 11 November 1927 – 20 September 2012 ) was an English scientist who contributed to understanding adhesion physics , and fracture of rubbery , crystalline and glassy polymers .
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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:  
Answer:
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