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He served three terms ( eleven years ) as the Chief Minister of Kerala ( 1980 - 1981 , 1987 - 1991 and 1996 - 2001 ) , making him the longest-serving holder of that office .
 Kerala
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kerala