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Oswiecim (Poland) (AFP) - 14:50 GMT - Duty to remember - "It is our duty to remember for ourselves and for the future," Polish President Bronislaw Komorowski says, concluding his opening speech to loud applause. 14:44 GMT - Eternal cemetery of the Jews - Polish President Bronisław Komorowski calls survivors "guardians of the memories of Auschwitz" and says xenophobia and anti-Semitism lay at the "foundations of the collapse of our civilisation" in the 20th century. "German Nazis made Poland an eternal cemetery of the Jews," he said through a translator. 14:41 GMT - Survivors - Elderly Auschwitz survivors sit among world leaders, many wearing swatches of striped blue cloth of the kind used for prison uniforms at the death camp.