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  "formats": "Każda podstrona ma dwie wersje z tymi samymi danymi: JSON (adres strony + .json) i markdown (adres strony + .md). Do każdego `url` w tym dokumencie można dopisać .json albo .md.",
  "title": "Nussknacker und Mausekönig",
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  "description": "Die kleine Marie findet am Weihnachtsabend unter dem Gabentisch einen Nussknacker, den sie gleich in ihre Obhut nimmt. Bald stellt sich heraus, dass ihn ein wunderbares Geheimnis umgibt. Die Geschichte von E. T. A. Hoffmann gehört heute zu den bekanntesten und beliebtesten Weihnachtsgeschichten in deutscher Sprache. Der vorliegende Band bietet den ungekürzten Text zusammen mit den meisterlichen Illustrationen von Lisbeth Zwerger.",
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      "title": "Nussknacker und Mausekönig",
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      "title": "Nussknacker und Mausekönig",
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      "title": "Nussknacker und Mausekönig",
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    {
      "title": "Ο Καρυοθραύστης και ο βασιλιάς των ποντικών",
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      "url": "https://www.kolczanksiazek.pl/e-t-a-hoffmann/el/o-karyothrafstis-kai-o-vasilias-ton-pontikon"
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      "url": "https://www.kolczanksiazek.pl/e-t-a-hoffmann/en/nutcracker"
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    {
      "title": "Cascanueces y el Rey Ratón",
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      "url": "https://www.kolczanksiazek.pl/ernest-t-a-hoffmann/es/cascanueces-y-el-rey-raton"
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    {
      "title": "Dziadek do orzechów",
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