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シャーロックホームズの白銀号事件(Silver Blaze)では、事件発生時に犬が吠えなかったという事実に気付いたホームズが、それを手掛かりに事件を解決しました。何かが起こらなかったということに着目できたのはホームズならではということでしょう。これは「鳴かなかった犬の推理」(The dog that didn’t bark)と呼ばれ、様々な場合に有効な思考法だそうですが、我々はホームズではありませんから、存在しないものには普段はなかなか気付きにくいものです。

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