C11112331312111112111133133313331333132323133313331313231323211211   >>    C1111233131211111211113313331333133313232313331333131323132321121   <<    C11112331312111112111133133313331333132323133313331313231323211213   >>      C11112331312111112111133133313331333132323133313331313231323211212   >>