C131121333133313233213331333133313331333133313331333133313123223212323211   >>    C13112133313331323321333133313331333133313331333133313331312322321232321   <<    C131121333133313233213331333133313331333133313331333133313123223212323213   >>      C131121333133313233213331333133313331333133313331333133313123223212323212   >>