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Chad expedition The slaver Rabih az-Zubayr had conquered the Bornu Empire , and France feared a threat to its borders in West and Equatorial Africa .
 Rabih az-Zubayr, Empire
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rabih az-Zubayr, Empire