C131121333133313233213331333133313331333133313133313231232313131   >>    C13112133313331323321333133313331333133313331313331323123231313   <<    C131121333133313233213331333133313331333133313133313231232313133   >>      C131121333133313233213331333133313331333133313133313231232313132   >>