C131121333133313233213331333133313331333133313331333133313331333211123232211   >>    C13112133313331323321333133313331333133313331333133313331333133321112323221   <<    C131121333133313233213331333133313331333133313331333133313331333211123232213   >>      C131121333133313233213331333133313331333133313331333133313331333211123232212   >>