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PowerPoint Presentation · 2021. 1. 25. · 2004-2014 9.86b 15.7m 2004 Prezi 10.63b 16.4m 2005 21b 20.2b 23b 27.4m 16.5b 15.33b 17.8b 23.6m 2009 18.83b 24.6m 2010 19.43b 24.7m 2011
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