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HOUSTON – The most accurate method for measuring the titanic punching power of Derrick Lewis, perhaps the unlikeliest heavyweight title contender in UFC history, is not to see how those jaw-dropping (and jaw-cracking) blows leave opponents stupefied, but to hear how they sound. “Like a shotgun,” says fight coach Bob Perez, shaking his head while patching together two 22-ounce focus mitts with duct tape for the umpteenth time.