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In 1976 , he became the youngest member ever elected to the Board of Directors of the Arkla Gas/Arkla , Inc. , a Fortune 500 natural gas company .
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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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