C11112331312111112111133133313331333132112312113313231333133313231123121211   >>    C1111233131211111211113313331333133313211231211331323133313331323112312121   <<    C11112331312111112111133133313331333132112312113313231333133313231123121213   >>      C11112331312111112111133133313331333132112312113313231333133313231123121212   >>