public function getQuestionAndApplicantIds(): array 	{ 		$applicants = $this->survey->getApplicants();  		$question_ids = $this->survey->getCategories()->pluck('questions')->flatten()->pluck('id')->toArray(); 		$applicant_ids = $applicants->pluck('id')->toArray();  		return [ 			'question_ids' => $question_ids, 			'applicant_ids' => $applicant_ids, 		]; 	}