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MINNEAPOLIS, MN - OCTOBER 05:  (L-R) Michael Johnson knocks out Danny Castillo with a series of punches during their lightweight fight at the UFC on FX event at Target Center on October 5, 2012 in Minneapolis, Minnesota.  (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
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MINNEAPOLIS, MN - OCTOBER 05: (L-R) Michael Johnson knocks out Danny Castillo with a series of punches during their lightweight fight at the UFC on FX event at Target Center on October 5, 2012 in Minneapolis, Minnesota. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)