Which Unangam Tunuu dialects are mutually intelligible?

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Within the Eskimo-Aleut languages family, the Unangam Tunuu language currently survives in two mutually intelligible dialects:12

A third historical dialect, Attu Unangam Tunuu, is extinct in Alaska; however, a creolized form known as Russian Aleut survives on Bering Island, incorporating Russian verbal inflections.12