C131121333133313233213331333133313331312111133133313331312111133133313232121211   >>    C13112133313331323321333133313331333131211113313331333131211113313331323212121   <<    C131121333133313233213331333133313331312111133133313331312111133133313232121213   >>      C131121333133313233213331333133313331312111133133313331312111133133313232121212   >>