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LONDON, ENGLAND - FEBRUARY 16:  (R-L) Paul Sass attempts an arm bar submission against Danny Castillo in their lightweight fight during the UFC on Fuel TV event on February 16, 2013 at Wembley Arena in London, England.  (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
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LONDON, ENGLAND - FEBRUARY 16: (R-L) Paul Sass attempts an arm bar submission against Danny Castillo in their lightweight fight during the UFC on Fuel TV event on February 16, 2013 at Wembley Arena in London, England. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)