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In page Champa:

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Evidence gathered from linguistic studies around Aceh confirms that a very strong Champan cultural influence existed in Indonesia; this is indicated by the use of the Chamic language Acehnese as the main language in the coastal regions of Aceh. Linguists believe the Acehnese language, a descendant of the Proto-Chamic language, separated from the Chamicic tongue sometime in the 1st millennium AD. However, scholarly views on the precise nature of Aceh-Chamic relations vary.[2]