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(190422) -- UNITED NATIONS, April 22, 2019 (Xinhua) -- Grand Chief Wilton Littlechild (1st R, front), a Cree Chief from Canada, attends the eighteenth session of the United Nations Permanent Forum on Indigenous Issues (UNPFII) at the UN headquarters in New York, April 22, 2019. "Traditional knowledge is at the core of our identity, our culture, our languages, our heritage and livelihoods, and must be protected," said the newly elected chair of the eighteenth session of the United Nations Permanent Forum on Indigenous Issues (UNPFII) on Monday. (Xinhua/Li Muzi)