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John Elliott ( Jack ) Nafe ( born July 22 , 1914 , Seattle ; died April 6 , 1996 ) was an American oceanographer and geophysicist best known for his work on acoustic propagation in the oceans and solid earth .
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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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