C11112331312111112111133133313331333132313233313232112323112121   >>    C1111233131211111211113313331333133313231323331323211232311212   <<    C11112331312111112111133133313331333132313233313232112323112123   >>      C11112331312111112111133133313331333132313233313232112323112122   >>