public function generateColumnTitle(string $department_value, string $extra_question_titles, array $locations): string 	{ 		$title = '';  		$title .= $department_value; 		$title .= $extra_question_titles ? ', ' . $extra_question_titles : '';  		foreach ($locations as $location) { 			$title .= ', ' . $location; 		}  		return $title; 	}