public QueryInterface::range($start = NULL, $length = NULL)
null $start:
null $length:
\Drupal\Core\Entity\Query\QueryInterface The called object.
public function range($start = NULL, $length = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Query!QueryInterface.php/function/QueryInterface::range/8.1.x