public function rules(): array 	{ 		return [ 			'country_name' => ['required', 'string', 'max:50'], 			'price_1_bottle' => ['required', 'numeric', 'min:0'], 			'price_2_bottle' => ['required', 'numeric', 'min:0'], 			'price_3_bottle' => ['required', 'numeric', 'min:0'], 			'price_4_bottle' => ['required', 'numeric', 'min:0'], 			'price_6_bottles' => ['required', 'numeric', 'min:0'], 			'price_12_bottles' => ['required', 'numeric', 'min:0'], 			'price_18_bottles' => ['required', 'numeric', 'min:0'], 			'price_24_bottles' => ['required', 'numeric', 'min:0'], 			'price_30_bottles' => ['required', 'numeric', 'min:0'], 			'price_36_bottles' => ['required', 'numeric', 'min:0'], 		]; 	}