Hilberts 25. Problem

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de Dieser Benutzer spricht Deutsch als Muttersprache. en-3 This user is able to contribute with an advanced level of English. bitmap‑3 This user is able to contribute at an advanced level to bitmap graphics (JPEG, PNG,...). VG-3 This user is able to contribute with a high level on vector graphics. PH-2 This user is able to take good quality photographs.
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