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    -coreDocument: "C62.31"
    -bookCollection: ""
    -pageCount: 24
    -documents: Doctrine\ORM\PersistentCollection {#7465 …}
    -favorites: Doctrine\ORM\PersistentCollection {#7500 …}
  }
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  +icon: "historical"
  -mostRecentAttributeCode: "most_recent"
  -localeContext: Sylius\Component\Locale\Context\CompositeLocaleContext {#1833 …}
}