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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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  "subtitle": null,
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  "url": "https://www.kolczanksiazek.pl/jan-kochanowski/fraszki-piesni-treny",
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  "authors": [
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