C11112331312111112111133133313331333132313233313231323221212131   >>    C1111233131211111211113313331333133313231323331323132322121213   <<    C11112331312111112111133133313331333132313233313231323221212133   >>      C11112331312111112111133133313331333132313233313231323221212132   >>