A man walks through the tornado destroyed cars of teachers at Briarwood elementary school in Oklahoma City, Oklahoma May 22, 2013.  Rescue workers with sniffer dogs picked through the ruins on Wednesday to ensure no survivors remained buried after a deadly tornado left thousands homeless and trying to salvage what was left of their belongings. Curvature of horizon in the photo is due to an ultra-wide angle lens.  REUTERS/Rick Wilking (UNITED STATES)
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