C13112133313331323321333133313331333133313331323133313112233121111113313231121   >>    C1311213331333132332133313331333133313331333132313331311223312111111331323112   <<    C13112133313331323321333133313331333133313331323133313112233121111113313231123   >>      C13112133313331323321333133313331333133313331323133313112233121111113313231122   >>