{
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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": "Utwory fortepianowe II GA CE S.B",
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      "first_published": "2026-07-14",
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      "first_published": "2024-01-01",
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      "first_published": "2024-01-01",
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    {
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      "first_published": "2019-04-01",
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    {
      "title": "Pisma muzyczne",
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    {
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}