M+M-1M+M-2M+M-3M+M-4M+M-5M+M-6M+M5-1M+M2-1M+M5-2M+M2-2M+M5-3M+M2-3M+M-7M+M-8M+M5-4M+M2-4M+M-9M+M-10M+M-11M+M-12