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Returning to Nigeria , between 1994 and 1997 he served as a consultant to the Federal Government of President Sani Abacha , in the areas of public policy formulation and implementation .
 Nigeria, Sani Abacha
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nigeria, Sani Abacha