French President Francois Hollande and German President Joachim Gauck (R) attend a ceremony to commemorate the centenary of the start of World War I (WWI) at the Vieil Armand "Hartmannswillerkopf" battlefield in the Alsace region, August 3, 2014. The year 2014 marks the 100th anniversary of the start of the World War I.[Photo/Agencies]
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