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Warning: Trying to access array offset on value of type bool in /home/kkwave/jinseiprogram.com/public_html/wp-content/themes/simplicity2/header-twitter-card.php on line 45 ニコニコ動画のサイバー攻撃の影響でN高生が使う学習アプリ「N予備校」利用できない状態で大量留年回避の「救済措置」レポート提出期限の延長決定！