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https://news.yahoo.co.jp/articles/0ff4b70f77fa8db3edc688db9622d12f53753985

Title:

北海道新幹線・後志トンネルが貫通 全長約18kmの難所突破 延伸区間の掘削率92%に 札幌延伸へ大きな前進

Source:

Yahoo!ニュース

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