C131121333133313233213331333133313331333133313113313231333131311221121121   >>    C13112133313331323321333133313331333133313331311331323133313131122112112   <<    C131121333133313233213331333133313331333133313113313231333131311221121123   >>      C131121333133313233213331333133313331333133313113313231333131311221121122   >>