C131121333133313233213331333133313331333133313331311223331323121   >>    C13112133313331323321333133313331333133313331333131122333132312   <<    C131121333133313233213331333133313331333133313331311223331323123   >>      C131121333133313233213331333133313331333133313331311223331323122   >>