File:École polytechnique, élèves s'entraînant au canon.jpg
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![File:École polytechnique, élèves s'entraînant au canon.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/%C3%89cole_polytechnique%2C_%C3%A9l%C3%A8ves_s%27entra%C3%AEnant_au_canon.jpg/800px-%C3%89cole_polytechnique%2C_%C3%A9l%C3%A8ves_s%27entra%C3%AEnant_au_canon.jpg?20210126100926)
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