D88EC7E8-E3FB-4F6D-A2CE-00F7A1C48C48@1xCreated with sketchtool.
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D88EC7E8-E3FB-4F6D-A2CE-00F7A1C48C48@1xCreated with sketchtool.ニコニコ動画で視聴

【TED】 The history of our world in 18 minutesニコニコ動画で視聴

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【TED】 The history of our world in 18 minutes

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