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1. More US news
   1. Oklahoma tornado kills 51, including 20 kids
   2. 'Confirmed casualties' at school flattened by tornado
   3. What you're seeing: Videos, images from the ground
   4. KFC cook records dramatic footage of monster storm
   5. Scientists study Tornado Alley's past and future
2. More top stories
   1. Oklahoma tornado kills 51, including 20 kids
   2. LIVE LOCAL COVERAGE: Twister deals destruction, death
   3. 'Confirmed casualties' at school flattened by tornado
   4. KFC cook records dramatic footage of monster storm
   5. Time-lapse: Tornado's path of destruction
3. Related videos
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      How to help OK tornado victims
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      Deadly Oklahoma tornado exceptional but all too familiar