From our friends at Wikimedia Indonesia: Supiak Abai speaks the Sijunjung-Simaung dialect of the Minangkabau language.

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Minangkabau is spoken by more than 5 million people, principally in the Indonesian province of West Sumatra, and neighboring North Sumatra, where it functions as a lingua franca between a diverse array of communities, as well as parts of Malaysia. An Austronesian language of the Malayo-Polynesian family, Minangkabau is closely related to Malay, as well as Balinese, Indonesian, and a myriad of others languages.