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Kelvin Michaúd Lewis ( born April 12 , 1988 ) is a guard for the Rio Grande Valley Vipers of the NBA Development League .
 Kelvin, Lewis, Rio Grande Valley Vipers, NBA Development League
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kelvin, Lewis, Rio Grande Valley Vipers, NBA Development League