public function rules(): array 	{ 		return [ 			'name' => ['required', 'string', 'max:50'], 			'countries' => ['array'], 			'countries.*' => ['required', 'string', 'uppercase', 'distinct', 'size:2'], 			'up_to_2_kg_price' => ['required', 'numeric', 'min:0'], 			'up_to_5_kg_price' => ['required', 'numeric', 'min:0'], 			'up_to_10_kg_price' => ['required', 'numeric', 'min:0'], 			'up_to_15_kg_price' => ['required', 'numeric', 'min:0'], 			'up_to_20_kg_price' => ['required', 'numeric', 'min:0'], 			'up_to_25_kg_price' => ['required', 'numeric', 'min:0'], 			'up_to_31_5_kg_price' => ['required', 'numeric', 'min:0'], 		]; 	}