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Peter competed mostly with cars from the Rootes Group , for whom he ran a number of motor dealerships based in Stevenage , Hertfordshire .
 Rootes Group, Stevenage, Hertfordshire
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rootes Group, Stevenage, Hertfordshire