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Though predominantly a Palaearctic genus with one introduced exotic species in North America ( A. curtum Heyden ) , there are two native North American species in the genus : A. alaskanum Wickham and A. yukonense Wickham .
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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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