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Strong has served three Governors of Oklahoma in various capacities since 1996 : Republican Frank Keating , Democrat Brad Henry , and Republican Mary Fallin .
 Strong, Oklahoma, Frank Keating, Brad Henry, Mary Fallin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Strong, Oklahoma, Frank Keating, Brad Henry, Mary Fallin