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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": "The Iron Trial",
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  "authors": [
    {
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      "title": "Próba żelaza",
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      "url": "https://www.kolczanksiazek.pl/cassandra-clare/proba-zelaza"
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    {
      "title": "O desafio de ferro",
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