Grid.php

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<?php
namespace Magento\Newsletter\Controller\Adminhtml\Template;

class Grid extends \Magento\Newsletter\Controller\Adminhtml\Template
{
    public function execute()
    {
        $this->_view->loadLayout();
        $grid = $this->_view->getLayout()->createBlock(
            \Magento\Newsletter\Block\Adminhtml\Template\Grid::class
        )->toHtml();
        $this->getResponse()->setBody($grid);
    }
}