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Its owners Midland Radio plc were taken over by the GWR Group in 1993 , the Nottingham and Mansfield FM services were branded 96 Trent FM , while the Derby service became known as RAM FM .
 Radio, GWR Group
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Radio, GWR Group