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