protected function pop(array $strings)
	{
		$cnt = count($strings);
		$i   = $cnt;
		while (--$i >= 0)
		{
			array_pop($strings[$i]);
		}

		// Remove empty elements then prepend one back at the start of the array if applicable
		$strings = array_filter($strings);
		if (count($strings) < $cnt)
		{
			array_unshift($strings, []);
		}

		return $strings;
	}