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Robert Mercer was Bishop of Matabeleland in Zimbabwe from 1977 to 1989 .
 Robert Mercer, Bishop of Matabeleland, Zimbabwe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert Mercer, Bishop of Matabeleland, Zimbabwe