public function rules(): array 	{ 		$validation_rule_builder = [];  		foreach (DomainLanguages::cases() as $language) { 			$lang = $language->value; 			$required = $lang === DomainLanguages::getDefaultLanguage();  			$validation_rule_builder['name_' . $lang] = [$required ? 'required' : 'nullable', 'string', 'max:100']; 		}  		return array_merge($validation_rule_builder, [ 			'industry_id' => ['nullable', 'exists:industries,id'], 		]); 	}