ContentEntityFormInterface

class \Drupal\Core\Entity\ContentEntityConfirmFormBase extends \Drupal\Core\Form\ConfirmFormInterface implements \Drupal\Core\Entity\ContentEntityForm
class \Drupal\Core\Entity\ContentEntityDeleteForm uses \Drupal\Core\Entity\EntityDeleteFormTrait implements \Drupal\Core\Entity\ContentEntityConfirmFormBase
class \Drupal\Core\Entity\ContentEntityForm extends \Drupal\Core\Entity\ContentEntityFormInterface implements \Drupal\Core\Entity\EntityForm

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