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Competitors Natalie Cook and Holly McPeak Many female beach volleyball players have suffered injuries by over-straining the abdominal muscles while many others have gone through augmentation mammoplasty to look appealing in their uniforms .
 Natalie Cook, Holly McPeak
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Natalie Cook, Holly McPeak