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In page History of Laos:

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The earliest inhabitants of Laos—Australo-Melanesians[citation needed], were followed by members of the Austro-Asiatic language family. These earliest societies contributed to the ancestral gene pool of the upland Lao ethnicities known collectively as "Lao Theung," with the largest ethnic groups being the Khamu of northern Laos, and the Brao and Katang in the south.[1]