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https://approach.yahoo.co.jp/r/QUyHCH?src=https://news.yahoo.co.jp/articles/06a6929eae9e355a2f5f03306b886bb79a4937e9&preview=auto
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http://ibidani-miharu.sakura.ne.jp/20180801 nine-circle_problem/20180801 nine-circle_problem.PDF
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http://ibidani-miharu.sakura.ne.jp/201904sangaku/201904wasantosangaku.html
ŠΗ—l 5ŒŽ 5“ϊ(–Ψ) 09:49
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http://ibidani-miharu.sakura.ne.jp/20210314sangaku-koukai/20210314sangaku-koukai.html