public function getAllowedPpiQuestionIds(ClientSurvey $client_survey): array 	{ 		$main_questions = $client_survey->mainQuestions()->pluck('questions.id')->all(); 						// basic questions 		$demographic_questions = $client_survey->demographicQuestions()->pluck('questions.id')->all();			// demographic questions  		return array_merge($main_questions, $demographic_questions); 	}