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Robbie Loomis is a former NASCAR crew chief who worked for Petty Enterprises and Hendrick Motorsports during his time as a crew chief , working most notably with Richard Petty and Jeff Gordon .
 Robbie Loomis, NASCAR, Petty Enterprises, Hendrick Motorsports, Richard Petty
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robbie Loomis, NASCAR, Petty Enterprises, Hendrick Motorsports, Richard Petty