public function down(): void 	{ 		Schema::table('client_surveys', function (Blueprint $table) { 			$table->dropColumn([ 				'number_of_employees_with_lower_qualification', 				'number_of_employees_with_middle_qualification', 				'number_of_employees_with_higher_qualification', 				'number_of_employees_with_special_qualification', 			]); 		}); 	}