Analysis of information sources in references of the Wikipedia article "Aomori Prefecture" in English language version.
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平内(ひらない)は蝦夷語の『ピラナイ』が語源とされています。……『ピラ』は山と山の間、『ナイ』は河川の意 (The name Hiranai is said to be derived from the Ezo word "Pira-nai." "Pira" means the space between mountains, and "nai" means a river.)