https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Entity%21EntityReferenceSelection%21SelectionInterface.php/function/SelectionInterface%3A%3AgetReferenceableEntities/8.9.x
function SelectionInterface::getReferenceableEntities | Drupal API
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https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Entity%21EntityReferenceSelection%21SelectionInterface.php/interface/hierarchy/SelectionInterface/9
SelectionInterface | Drupal API
drupalapi