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$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$registry = $objectManager->get('Magento\Framework\Registry');
$registry->register('isSecureArea', 'true');

// OrderId used to select which order to remove
// $orderId = 0;

// OrderRange used to select the range of orders to delete (0 to 30)
// $orderRange = [0, 30];