C131121333133313233213331333133313331333133313331311221123121211   >>    C13112133313331323321333133313331333133313331333131122112312121   <<    C131121333133313233213331333133313331333133313331311221123121213   >>      C131121333133313233213331333133313331333133313331311221123121212   >>