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The Vortex Flash Hider has been called the " most effective flash hider available short of a ( sound ) suppressor " by writer and gunsmith Patrick Sweeney , when used on an AR15 .
 Patrick Sweeney
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Patrick Sweeney