C131121333133313233213331333133313331333133313113313331323133313331311333112121   >>    C13112133313331323321333133313331333133313331311331333132313331333131133311212   <<    C131121333133313233213331333133313331333133313113313331323133313331311333112123   >>      C131121333133313233213331333133313331333133313113313331323133313331311333112122   >>