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In page Ainu people:

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Although some researchers have attempted to show that the Ainu and Japanese languages are related, modern scholars have rejected the idea that the relationship goes beyond contact, such as the mutual borrowing of words. No attempt to show a relationship with Ainu to any other language has gained wide acceptance, and linguists currently classify Ainu as a language isolate.[6] Most Ainu people speak either Japanese or Russian.[citation needed]