[¹-[¹]][¹-[¹-[¹-[]]]]]+[¹-[¹-[¹-[¹-[¹]]]]]+[¹-[¹-[¹-[¹-[¹]]]]]+[¹-[¹-[¹-[¹-[¹]]]]]+[¹-[¹-[¹-[]]]]][¹-[-]]