C131121333133313233213331333133313331333133313113313331211111232121223111   >>    C13112133313331323321333133313331333133313331311331333121111123212122311   <<    C131121333133313233213331333133313331333133313113313331211111232121223113   >>      C131121333133313233213331333133313331333133313113313331211111232121223112   >>