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    "name": "Kołczan Książek",
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    "url": "https://www.kolczanksiazek.pl"
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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": "Matematyka Jakie to proste!",
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  "authors": [
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      "title": "Matematyka Jakie to proste!",
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    {
      "title": "Matematyka. Jakie to proste!",
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      "isbn": "978-83-2134-758-5",
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