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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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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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