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His sons Leo and Greg inherited his helmet design , but Leo 's helmet has the red chin area and the white part that envelops the visor ( not counting the top ) is red with white outline , while Greg 's helmet has the blue chin area and the white area that envelopes the visor is blue with white outline .
 Leo, Greg, Leo, Greg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leo, Greg, Leo, Greg