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http://kmk.malaika.jp/2017/05/17/%e3%81%a9%e3%81%a3%e3%81%a1%e3%81%8c%e7%b5%82%e3%82%8f%e3%82%8b%e3%81%ae%e3%81%8c%e5%85%88%e3%81%8b/
どっちが終わるのが先か