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1c:T11fd,初めまして。

大学数学を理解していないと解けない問題とはどんな問題を指しているのでしょうか？私は受験生時代東北大の数学も13年分ほど解きましたが、そのように感じられる問題はなかった記憶です。

もちろん数3では高校範囲だと証明できないものがあります（中間値の定理等）。また、例えば「x>0のとき、不等式sinx>x-x^3/6を示せ」という問題であれば、不等式の右辺はどこから出てきたのだろうと思うことはあるかもしれません。

ですが総じて大学範囲を理解しなければならないことは問題にするほど多くないと思います。

私自身はこれまで数学にかなり没頭してきましたが、高校範囲で「受験勉強」として取り組んだ内容は無駄になったとは感じていません。少なくとも現在学んでいる微分積分学は数3をもっと厳密に、拡張したような話が多いですし、線形代数学は行列という新しい分野ですが、ところどころベクトルのときに学んだことが役立っているように感じます。

ですが、質問者様のように受験がそういったゲームのようになっているというのも分かります。昔中国では科挙という試験が実施されていましたが、その試験では漢詩を始めとした非常に多くのことを暗記して挑む試験でした。そして、その試験にさえ合格すれば将来は安泰どころか裕福に暮らせたようです。

現行の受験制度もある種そうなっているのでは無いでしょうか。ハッキリ言えば、高校生の勉強の受験ぐらいで上手くいかない人は「学問の学ぶ姿勢」を追求したところで自信で学び切ることは出来ないという根本的な考えがあるのだと思います。当然高校の勉強は出来なかったけど天才的な研究や発見をする人もいるのかもしれませんが、母数として多くないのは明白でしょう。

「たくさんの科目に手を出していることで、学問の本質を見失っている」という指摘については、私の意見としては「まだその指摘をするには早い」という感じですね。もちろん私がその指摘をするにもまだ早いです。大袈裟に言えば我々が寿命を迎えるときにはじめて「あの勉強はいらなかった」と思うことが出来ます。

結局この教育の根幹を作った人たちは、「幅広く学ばせて、どれかが当たればいいな」みたいな発想なのでしょう。

回答作成中に思ったことですが、数学より理科（物理、化学）の方が大学範囲を黙認することが多いですね。解く上で黙認すると言うよりは、その定義自体に黙認があったり。そもそも高校で学ぶ特に理系科目というのは、非常に限られた都合のいい場合のみ扱います。数学の条件付き極値問題であれば三角関数を使ったり線形計画法を使って上手く解けるような変数の次数になっていたり、物理の公式であればその厳密な証明が大学範囲の微分積分だったり、化学では条件が綺麗すぎたり。

学問というのは具体から始まると考えています。例えば物理学の、ニュートンの運動方程式は実験事実です。つまり実験（具体）を通して一般的に正しい（抽象）とされました。数学であれば、有名なフェルマーの最終定理がありますが、あの問題は初めからn一般について示された訳ではなく、まずはn=3,4,5と示されたのです。化学でいえば、周期表は具体→抽象の一例ではないでしょうか。

そういう観点で高校の学習を振り返ってみると、限られた場合にしか出来ないような解法、考え方であっても、今後「学問」を修めるにあたって抽象化するときに役に立つことでしょう。

以上。少々まとまりがない形になってしまい申し訳ありません。このような疑問をもてる質問者様は素晴らしいと思います。もしかしたら何かやりたい研究等があるのでしょうか。であれば私と同じですね。是非受験をパスしてやりたい学問に取り組み、貢献して欲しいですね。頑張ってください。応援しています。1d:Tbd9,東北大学薬学部のヒロです。勉強における基礎とは何か、そして応用が解けるようになるためのアドバイスを教えます。参考になれば幸いです。

まず、問題を解くためには2段階の能力が必要で、一つ目は「知る」こと、そして二つ目は「使える」ことです。

一つ目の「知る」こととは、（当然ですが）教科書で公式や物質、単語について学ぶことであり、身につけることが必要な知識のことです。ただ、多くの人、というよりほぼ全員が勘違いしているのですが、「知る」ことは公式暗記や単語暗記ではありません。例えば簡単な例で言うと、二次方程式ax^2+bx+c=0を「完璧に」場合分けして答えられるか、英語で「3年がたった」を3通りで言えるか、酸化剤としての過マンガン酸カリウムの酸性条件と塩基性条件での変化とその理由など。もちろんこれらはほんの一例であり、すべての科目、すべての知識において前提条件や関連項目があります。

二つ目の「使える」こととは、実際に「知る」ことができた知識を使い、応用問題に対応できる力のことをいいます。どれだけ単語や公式を知っていたとしても、応用問題で「使える」ことができなければ意味がありません。「知る」段階で条件などを細かく学んだ人は、本当に「使える」人です。

「知る」ことは、公式や単語の丸暗記ではありません。受験生のほとんどは丸暗記することで「知る」ことができたと誤認して、いざ応用問題に手を出すと全く解けない状態に陥ります。逆に応用問題をすらすら解く受験生は、「知る」段階にて条件や公式の意味を本当の意味で「知る」人です。もしも先ほどの例を知らないのならば、そのかさんは本当に「知る」ことができていない状態です。でも、がっかりする必要はありません。今はまだ基本問題を解いているのであれば、今からでも遅くありません。使えないのに応用問題に手を出す方がよっぽど危険です。基本問題を解きながら、なぜこの公式なのか、他の答えだと不正解なのかなど、きちんと条件などを確認して、自信を持って「知る」ことができると言えるようになりましょう。

話をまとめると、基礎ができるとは、公式や単語を覚えることではなく、「使える」ようになるために「知る」ことなのです。それを意識して勉強していけば、必ず「使える」状態になります。大変かもしれませんが、本当の意味で「使える」状態になれば、周りの受験生とぶっちぎりの差が生まれます。受験勉強頑張ってください！応援しています！1e:Tc93,数学と化学に関しては私も現役の時は心当たりがあります。特に数学はセンス的な要素が強いと思っていたので、解ける解けないの差が激しかったです。

さて、少しひねった問題が来ると解けないのが悩みということですが、まず、最低限の勉強ができていることが大事です。おそらくそこらへんはテスト期間で補っているので大丈夫かと思います。

その中で同じような問題で少しひねっている問題というのはどうすればいいかわからないと思うかもしれませんが、解き方としてはひねる前の解き方と同じようなのに気づくことはできているでしょうか？そのような問題の模範解答をじっくり吟味しているでしょうか？その時解けなかった問題はしょうがないですが、そのあとのフィードバックが大事です。そして、この解法やったことがあるなと感じることが大切です。

具体的に述べるのは難しいですが、例えば二次方程式の2解が正の値をとるための条件は
f(0)>0
軸>0
判別式≧0
で必要十分ですよね。これは大丈夫でしょうか？

これの少しひねった問題が例えば二次方程式の解が0<x<1の範囲で持つ条件はどうでしょうか？
これは場合分けが必要ですが、そのうち2解がともに0<x<1の範囲の時はどのような条件かというと
f(0)>0
f(1)>0
0<軸<1
判別式≧0
で必要十分です。これと先ほどの上の条件と比較すると同じような感じですよね？つまり端点のみに具体的な数字の条件があるときにこのような条件で進めていくのがセオリーです。

上の解法を知識ゼロから解けと言われたら厳しいものがあるかと思いますが、一通り通っていることなら問題を見たときに「あっ、この問題はこの解法かな？」と瞬時に判断できるはずです。その感覚が大事です。「あー、これどうすればいいんだっけ…？」みたいな感じになっているのは良くないです。

これは勉強する時は問題を解き始める前に一瞬立ち止まって考えください。これを意識するしないとでは雲泥の差です。これは私自身、現役の時には気づかなかったことですが、浪人してからはこのことを意識するだけで、解ける問題のレパートリーが増えました。

闇雲にただ問題をこなすだけなら、むしろその場しのぎになってしまいます。それなら、数学の問題とかは時間がないのなら問題をみてこのような解法でいけばいいかなと思えるなら解かなくていいです。

要は、解き方に“意識“して問題演習を行ってください。時間のかける方はこっちの方です。

模試の前とかは、全国模試であれば定期テストなどでできなかった問題の教科書レベルの類題を確認する感じでいいと思います。高校生は部活等で時間がないと思われますので。2:["$","main",null,{"className":"px-4 pt-4 pb-4","children":["$","div",null,{"className":"max-w-3xl mx-auto w-full","children":[["$","div",null,{"className":"mb-8","children":["$","$L7",null,{"href":"https://unilink-app.onelink.me/isbO/h6xeh63x?advice=vpCFcmEBEoAxXtWxcmt0","target":"_blank","children":["$","$L8",null,{"src":"/images/web_to_app_banner.jpg","width":3660,"height":1500,"sizes":"100vw","style":{"width":"100%","height":"auto"},"alt":"UniLink WebToAppバナー画像","className":"mb-4 rounded"}]}]}],["$","h1",null,{"className":"text-xl font-semibold mb-2","children":"公式、定理の証明の重要性"}],["$","div",null,{"className":"flex justify-between mb-4","children":[["$","div",null,{"className":"text-left text-xs text-caption","children":["クリップ(",8,") コメント(",1,")"]}],["$","div",null,{"className":"text-right text-xs text-caption","children":"2/8 8:06"}]]}],["$","div",null,{"className":"coach-mark mb-4","children":"UniLink利用者の80%以上は、難関大学を志望する受験生です。これまでのデータから、偏差値の高いユーザーほど毎日UniLinkアプリを起動することが分かっています。"}],["$","div",null,{"className":"mb-4","children":["$","$L13",null,{"clientImageUrl":null,"clientUserName":"hori ","infoString":"高3 福岡県 九州大学工学部(60)志望","adviceId":"vpCFcmEBEoAxXtWxcmt0"}]}],["$","div",null,{"className":"mb-8","children":[["$","div",null,{"className":"leading-loose whitespace-pre-wrap","children":[["$","div","consultation-part-0",{"children":[null,"数学の公式や定理の証明はやはり重要なのでしょうか。私の通っている高校では、公式の証明に一切触れないのですごく不安です。"]}]]}],["$","div",null,{"className":"pt-4","children":["$","$L14",null,{}]}],null]}],["$","h1",null,{"className":"text-xl font-semibold mb-2","children":"回答"}],["$","div",null,{"className":"mb-4","children":["$","$L15",null,{"adviserImageUrl":null,"adviserName":"hgout","adviserDepartment":"東京大学文科二類","adviceId":"vpCFcmEBEoAxXtWxcmt0"}]}],["$","div",null,{"className":"coach-mark mb-4","children":"すべての回答者は、学生証などを使用してUniLinkによって審査された東大・京大・慶應・早稲田・一橋・東工大・旧帝大のいずれかに所属する現役難関大生です。加えて、実際の回答をUniLinkが確認して一定の水準をクリアした合格者だけが登録できる仕組みとなっています。"}],["$","div",null,{"className":"mb-8","children":[["$","div",null,{"className":"leading-loose whitespace-pre-wrap mb-4","children":[["$","div","advice-part-0",{"children":[null,"旧帝大志望理系ですね？\n受験でという意味なら、重要というより、知っていて当たり前という感じです。公式や定理を特別に覚えようとはしませんが、大学入試ででる証明のほうがよっぽど難しいから、公式や定理の証明という基礎的なものは特別に勉強してなくてもなんとなくわかるという感じです。(もちろん大学レベルの証明が必要な公式もありますのであくまで教科書に乗っている証明の話です)\n私は数学系が専門なので、入試とかの枠を超えて数学を勉強する学生としての意見をいうと、公式の証明はとても重要です。なぜならば、大学では公式をどのように使うかよりも、どうやって公式を導いたか、またどうやって新しい公式を自分で作り出すことができるかを勉強するからです。大学では公式を使うことよりも、導くことの方がずっとずっと難しくなると思ってください。\nまとめると、公式は重要だけど、高校レベルでは簡単な証明だからわざわざ｢覚える｣というものでもないということでした。"]}]]}],["$","div",null,{"className":"mb-4","children":["$","$L16",null,{"adviserImageUrl":null,"adviserName":"hgout","adviserDepartment":"東京大学文科二類","adviceId":"vpCFcmEBEoAxXtWxcmt0","numberOfFan":118,"clipsAvg":44.625,"adviceRateAvg":4.661016949152542,"profile":"某地方私立中高一貫→東大文二→経済学部(4年)。独学。現役。単願。社会は世界史日本史。理科は物理。バイトの関係で塾の内情や私立受験にも詳しいです。基本的に、現実的なアドバイスしかしません。その分、今本当にすべきことは何かを、ちゃんとアドバイス出来ると思います。"}]}],["$","div",null,{"children":["$","$L7",null,{"href":"https://ck.jp.ap.valuecommerce.com/servlet/referral?sid=3364577&pid=884970531&vc_url=http%3A%2F%2Fshingakunet.com%2F%3Fvos%3Dnrmnvccp0000100","rel":"nofollow","target":"_blank","children":["$","$L8",null,{"src":"/images/document_request_banner.jpg","width":3660,"height":1500,"sizes":"100vw","style":{"width":"100%","height":"auto"},"alt":"UniLink パンフレットバナー画像","className":"mt-4 rounded"}]}]}],["$","div",null,{"className":"pt-4","children":["$","$L17",null,{"id":"adsbygoogle-init-under-advice"}]}]]}],["$","div",null,{"className":"flex justify-between","children":[["$","h1",null,{"className":"text-xl font-semibold","children":["コメント(",1,")"]}],["$","$L18",null,{"adviceId":"vpCFcmEBEoAxXtWxcmt0"}]]}],["$","div",null,{"className":"mb-8","children":["$","div",null,{"className":"divide-y","children":[["$","div",null,{"className":"flex py-4","children":[["$","div",null,{"className":"mr-2","children":["$","$L19",null,{"avatarUrl":null,"contributorName":"hori ","adviceId":"vpCFcmEBEoAxXtWxcmt0"}]}],["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"flex justify-between","children":[["$","div",null,{"className":"mb-2","children":["$","$L1a",null,{"contributorName":"hori ","adviceId":"vpCFcmEBEoAxXtWxcmt0"}]}],["$","div",null,{"className":"text-xs text-caption","children":"2/8 19:22"}]]}],["$","div",null,{"className":"text-xs whitespace-pre-wrap","children":"ありがとうございます！\nこれからは公式の証明を深く考えすぎず、できるのは当たり前という感覚で勉強をしていこうと思います！\n"}]]}]]}]]}]}],["$","h1",null,{"className":"text-xl font-semibold","children":"よく一緒に読まれている人気の回答"}],["$","div",null,{"className":"mb-8","children":["$","div",null,{"className":"divide-y","children":[["$","div",null,{"children":["$","$L7",null,{"href":"/advice/YVJTj4ABTqPwDZPuV3I-","children":["$","div",null,{"className":"flex items-center py-4","children":[["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"mb-1","children":"公式の証明"}],["$","div",null,{"className":"text-xs text-caption line-clamp-2 mb-1","children":"こんにちは！東北大学文学部のkitaです！\nお答えさせて頂きます！\n\n理想としては、教科書で習った公式は証明できないといけません。\n大学の先生に、参考書にあったよね？と言われても知らん！と言えますが、教科書でやったよね？、と言われたら何も言えません😅\n\nただ、全てを意味もなく丸暗記するのはナンセンスです。\nそこで、僕が実際に行っていたのは、何度も出る公式（使用頻度が多い）や、今までに他の大学も含め問われたことのある公式、は必ずやりました！\n例としては、正弦余弦、加法定理、点と直線の距離公式、積分の面積公式あたりが王道でしょうか。\n\n他には、僕は数学が好きだったので、ちょっと勉強に疲れた時に、息抜きとして公式の証明を調べて、エレガントな証明方法があると感動してました（笑）\n\n数学の定理や公式の証明は、1つの証明にさまざまな知識を必要とします。それなので、基礎がないと自力で行うのが難しいですし、逆に出来るようになるとかなりの数学がついた、と言ってもいいでしょう。\n\n質問の的確な答えになっているか分かりませんが、入試に出るかも大事ですが、その定理や公式の根本を知ると、間違いなく入試に役立ちます！\n\n最後に、たくとさんの目標が達成されることをお祈りしています。頑張ってください！！"}],["$","div",null,{"className":"flex mb-1","children":[["$","svg",null,{"stroke":"currentColor","fill":"currentColor","strokeWidth":"0","viewBox":"0 0 24 24","className":"text-subPrimary mr-1","children":["$undefined",[["$","path","0",{"fill":"none","d":"M0 0h24v24H0V0z","children":[]}],["$","path","1",{"d":"M12 6c1.1 0 2 .9 2 2s-.9 2-2 2-2-.9-2-2 .9-2 2-2m0 10c2.7 0 5.8 1.29 6 2H6c.23-.72 3.31-2 6-2m0-12C9.79 4 8 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items-center py-4","children":[["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"mb-1","children":"公式の証明について"}],["$","div",null,{"className":"text-xs text-caption line-clamp-2 mb-1","children":"こんにちは！回答させていただきます。\n\n公式の証明を覚えているとどう役に立つかということですが、正直、受験に合格するという観点では公式の証明問題が解ける以上のメリットはあまりないです！\n公式の証明では、受験数学のセオリーからみれば特殊な考え方を使うものが多く、考え方が他の問題に役立つ事も少ないのです。\n数学という学問を修める意味では、公式の証明を理解していることは重要だと思いますが。\n\nしかし、本番で公式の証明問題が解けるという一点だけで、覚える理由としては十分ではないでしょうか？\n実際の入試でそういった問題が出ているわけですし。4完を狙うなら公式の証明問題は落とせませんしね！\n\n余談ですが、三角関数の和積の公式とか、ベクトルの内積を使った三角形の面積の公式とかを、もし暗記せずにテスト中に導こうと思ってるなら、それはダメですよ！時間がもったいないですから。これはマジです！\n\n長文失礼しました。頑張ってくださいね！\n\n\n\n\n"}],["$","div",null,{"className":"flex mb-1","children":[["$","svg",null,{"stroke":"currentColor","fill":"currentColor","strokeWidth":"0","viewBox":"0 0 24 24","className":"text-subPrimary mr-1","children":["$undefined",[["$","path","0",{"fill":"none","d":"M0 0h24v24H0V0z","children":[]}],["$","path","1",{"d":"M12 6c1.1 0 2 .9 2 2s-.9 2-2 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items-center py-4","children":[["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"mb-1","children":"数学の勉強法について"}],["$","div",null,{"className":"text-xs text-caption line-clamp-2 mb-1","children":"　数弱で浪人した者です。私は、質問者様が現在の勉強法を継続される事を断固支持します。確かに時間が余計に掛かる道ですが、それで問題を解くのが少しでも楽になる事を体感されているのは素晴らしいことですし、それが正しい勉強法です。\n\n　さて、この勉強法で間に合うかどうかですが、定理公式が出てきた度に取り組めば受験に間にあわないなんてことにはならないでしょう。むしろ焦って暗記に走る方が何倍も危険です。受験直前になってもなおうわべだけで分かったつもりになっているというレベルの知識は、入試本番では使い物になりません。そんな知識だけで受験に挑むのは落ちに行ってるようなものです。数学はそんなに甘くありません。数学は身につけるもの、そして、身につけるには自分の手を動かして理解していく事を繰り返すしかありません。証明を忘れてしまったら何度でも復習して下さい。私もこれを幾度となく繰り返しました。また、有名な定理公式の導出方法＝証明を知っているとあっさり解ける、なんて問題も整数分野などではよくあります。\n\n　一つお勧めは、問題の解答を見てとっぴな解法だなあと感じることがあれば、それは問題の基礎的な部分が分かってない証拠だと疑ってみることです。例えば数学が全くできない人に問題を解説してあげるとき、自分では当たり前に感じている箇所で、\"なんでそうやんの？\"と聞かれたことはないですか？普段の問題の解説集も同じで、解法が自分にとってとっぴに見えてしまったら、その問題の要求するレベルに達してないと判断して間違いないです。質問者様の質問には直接関係ないですが、私が受験経験から学んだことですのでお伝えしておきます。\n\n　学問では回り道に見えることが結局は王道です。私は予備校でそれを痛感させられました。めんどくさそうで遠ざけていた定理公式の証明を自分の手で行なって初めて習得できた実感をえました。質問者様の強みは今すでにこの遠回りの威力を知っておられるということです。どうか自分を信じこの努力を続けて下さい。健闘を祈ります。"}],["$","div",null,{"className":"flex 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items-center py-4","children":[["$","div",null,{"className":"flex-1","children":[["$","div",null,{"className":"mb-1","children":"数学の解法暗記"}],["$","div",null,{"className":"text-xs text-caption line-clamp-2 mb-1","children":"こんばんは。\r\n\r\n高校の数学は、おっしゃる通り、中学までの数学と比べると、様々か角度からのアプローチができるようになります。ですが、（少し厳しいことを書くかもしれませんがお許し下さい）名古屋大学を受験するにあたって、解法を一つしかわかっていないようでは、合格への道はかなり遠いと思います。\r\n\r\nといいますのも、名古屋大学の数学の入試は文系理系問わず、試験当日全員に、問題冊子、解答用紙に加えて、数学公式集が配布されます。（もちろん公式集には全ての公式が掲載されているわけではありませんが）数学の入試で、公式集が配布されるということは、つまり、「ただ単に、公式に代入して、答えが求められる」ことのできる人を大学が求めているわけではないでしょうし、そのような人が有利な採点はなされないという大学側からのメッセージではないかと思います。\r\n\r\nこのように考えますと、解法を何通り覚えたかではなく、なぜその公式・定理を使うのかということの方が大切だと思います。ただし、いきなりなぜその公式・定理を使うのかということを意識するとハードルが高すぎる可能性もありますので、まずは、複数解法のある問題に関しては、どの解法が最も計算が楽かや、どの解法が最もミスをしにくいかというような意識で、最終的には「解き方を暗記する」のではなく「なぜその公式・定理を使うのか」というような意識で数学を学習していくといいのではないかと思います。\r\n\r\nまだ３年生の5月です。現段階で、駿台模試でC判定をお持ちであれば、このままの調子で勉強していけば、合格できると思いますよ。頑張ってください。\r\n"}],["$","div",null,{"className":"flex 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mb-1","children":"三味線さん、はじめまして。\n\nお気持ちはすごく分かります。\nたしかに解答の細かいところに疑問を持ったり、その都度公式を導出していると参考書の進むペースは遅くなってしまいますが、その分、質は高くなると思うので全然良いことだと思いますし、むしろそうするべきだと思います。\n\nよく言われる「数学は理解」という言葉は、なぜその公式を使ったのか、なぜその解法で解くのか、なぜその変換を行うのか、もっと細かいことで言うと、なぜその順に解答を記述するのかといったことを理解することです。\n\n「数学は暗記」という言葉もたまに聞きますが、これは単純に英単語みたいに暗記すると言うことではなくて、どうしてこの解法を使うのかを理解した上でどうゆう問題が出たらどの解法を使うのかを暗記すると言うことです。\n仮に理解の過程を飛ばして暗記だけすると、少し問題の形が変わっただけで解法が思い浮かばないということになってしまいます。\n\nそして理解を深めるためには、三味線さんのように細かいところにも疑問を持って問題を解くのが一番の近道です。公式は導出ができる方が理解度ははるかに上がりますし、たまにある公式の導出に基づいた問題なんかも出題されることもあります。\nまた質問文中のことで触れると、なぜ置換積分はこうゆう形でするのか、一次独立とは何か、解答に使われている言葉の意図、こういったことに疑問をもって考えるのはとても良いことだと思います。確認しても忘れてしまうのは人間なので仕方ないことで、確認してその時に理解したことをノートなんかに纏めておきましょう。次に同じような疑問が出た時にノートを見返すことで少しずつ定着して力になっていくはずです。\n私の場合だと2.3回では定着せず、5回とか10回その都度見返すことで定着し始めた感じだったので、忘れているから力になっていないと焦らずに、自分のペースで頑張ってください！\n\n応援しています☺️\n"}],["$","div",null,{"className":"flex mb-1","children":[["$","svg",null,{"stroke":"currentColor","fill":"currentColor","strokeWidth":"0","viewBox":"0 0 24 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