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CHICAGO, IL - JULY 25:   (L-R) Paul Felder delivers a spinning back fist against Edson Barboza of Brazil in their lightweight bout during the UFC event at the United Center on July 25, 2015 in Chicago, Illinois. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
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CHICAGO, IL - JULY 25: (L-R) Paul Felder delivers a spinning back fist against Edson Barboza of Brazil in their lightweight bout during the UFC event at the United Center on July 25, 2015 in Chicago, Illinois. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)