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The original intention of the writers had been to kill off Rhys at the end of the first series , but series creator Russell T Davies found it necessary to keep the show grounded through Rhys as Gwen evolved as a character .
 person: Russell T Davies
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: Russell T Davies 
Answer:
 person: Russell T Davies