C13112133313331323321333133313331333133313331333133313123132121   >>    C1311213331333132332133313331333133313331333133313331312313212   <<    C13112133313331323321333133313331333133313331333133313123132123   >>      C13112133313331323321333133313331333133313331333133313123132122   >>