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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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    {
      "title": "Karol Wielki. Cesarz i święty",
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      "url": "https://www.kolczanksiazek.pl/ernst-w-wies/karol-wielki-cesarz-i-swiety",
      "first_published": "2016-06-21",
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    {
      "title": "Cesarz Henryk IV. Canossa i walka o panowanie nad światem",
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    {
      "title": "Fryderyk Barbarossa. Mit i rzeczywistość",
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  "narrations": null
}