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Left to right, Great Britain Prince William, his wife Catherine, Duchess of Cambridge, French President Francois Hollande, Belgian Queen Mathilde and King Philippe, German President Joachim Gauck, Spanish King Felipe and Luxembourg Hereditary Grand-Duke Prince Guillaume attend a ceremony at the Cointe Inter-allied Memorial, commemorating the 100th anniversary of the outbreak of World War I (WWI) in Liege, Belgium, Aug. 4, 2014.