C11112331312111112111133133313331333132323221311221123231311211   >>    C1111233131211111211113313331333133313232322131122112323131121   <<    C11112331312111112111133133313331333132323221311221123231311213   >>      C11112331312111112111133133313331333132323221311221123231311212   >>