C131121333133313233213331333133313331333133313112211231323112121   >>    C13112133313331323321333133313331333133313331311221123132311212   <<    C131121333133313233213331333133313331333133313112211231323112123   >>      C131121333133313233213331333133313331333133313112211231323112122   >>