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SAN DIEGO, CA - DECEMBER 16:  (L-R) Strikeforce Womens Featherweight Champion Cristiane "Cyborg" Santos and challenger Hiroko Yamanaka face off aftering weighing in during the Strikeforce Official Weigh In at the Valley View Casino Center on December 16, 2011 in San Diego, California.  (Photo by Josh Hedges/Forza LLC/Forza LLC via Getty Images)