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Associated Press
Lights paying tribute to 1915 are shown on the tower of the Ferry Building Tuesday, March 31, 2015, in San Francisco. The 245-foot tower is illuminated with the white lights until December to mark the 100th anniversary of the Panama-Pacific International Exposition. The exposition celebrated the completion of the Panama Canal and to showcase San Francisco following its recovery after the 1906 earthquake. (AP Photo/Eric Risberg)

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