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In late 2005 , he was approached by the team of Marcello G. Martorelli and Steve Currey to be part of the expedition to the North Pole as a linguist specializing in Gina'abul ( proto-Sumerian ) language ; the expedition failed due to the untimely death of Steve Currey .
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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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