C131121333133313233213331333133313331333133313331333133313123223212121   >>    C13112133313331323321333133313331333133313331333133313331312322321212   <<    C131121333133313233213331333133313331333133313331333133313123223212123   >>      C131121333133313233213331333133313331333133313331333133313123223212122   >>