C13112133313331323321333133313331333133313331323133313112233121111132212121   >>    C1311213331333132332133313331333133313331333132313331311223312111113221212   <<    C13112133313331323321333133313331333133313331323133313112233121111132212123   >>      C13112133313331323321333133313331333133313331323133313112233121111132212122   >>