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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": "Uso de las perifrasis verbales",
  "subtitle": null,
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  "authors": [
    {
      "name": "David Vargas",
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  "description": "Despues de la publicacion de Actua A1+, con Actua A2, Edelsa da un paso mas con el objetivo de ofrecer a los estudiantes de Nivel A2 un material de apoyo y refuerzo de sus conocimientos de espanol asi como facilitarles un material de autoaprendizaje que les permita desarrollar sus estrategias para...",
  "editions": [
    {
      "title": "Uso de las perifrasis verbales",
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      "url": "https://www.kolczanksiazek.pl/david-vargas/uso-de-las-perifrasis-verbales/9788477112280",
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      "isbn": "978-84-7711-228-0",
      "pages": 176,
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