This three-photo combo shows a scene taken on May 23, 2011, top, July 21, 2011, center, and May 7, 2012, bottom, shows progress made in Joplin, Mo. in the year after an EF-5 tornado destroyed a large swath of the city and killed 161 people. (AP Photo/Charlie Riedel)

Associated Press
This three-photo combo shows a scene taken on May 23, 2011, top, July 21, 2011, center, and May 7, 2012, bottom, shows progress made in Joplin, Mo. in the year after an EF-5 tornado destroyed a large swath of the city and killed 161 people. (AP Photo/Charlie Riedel)
This three-photo combo shows a scene taken on May 23, 2011, top, July 21, 2011, center, and May 7, 2012, bottom, shows progress made in Joplin, Mo. in the year after an EF-5 tornado destroyed a large swath of the city and killed 161 people. (AP Photo/Charlie Riedel)
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