{
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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.",
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  "books": [
    {
      "title": "Cztery ściany i dach. Złożona natura prostej profesji",
      "subtitle": null,
      "slug": "cztery-sciany-i-dach-zlozona-natura-prostej-profesji",
      "url": "https://www.kolczanksiazek.pl/reiner-de-graaf/cztery-sciany-i-dach-zlozona-natura-prostej-profesji",
      "first_published": "2019-12-12",
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}