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Nebula was also a fan favourite : author Ken Bulmer recalled that it became " what many fans regard as the best-loved British SF magazine " .
 person: Ken Bulmer
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Ken Bulmer 
Answer:
 person: Ken Bulmer