The Hawu language of Savu Island is suspected of having a non-Austronesian substratum, but perhaps not to a greater extent that other languages of central and eastern Flores, such as Sika, or indeed of Central Malayo-Polynesian in general.
The Sumba languages are all closely related. Blust (2009) found convincing evidence for linking Sumba with Hawu, the most divergent language.
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