C131121333133313233213331333133313331333133313231333132313131221   >>    C13112133313331323321333133313331333133313331323133313231313122   <<    C131121333133313233213331333133313331333133313231333132313131223   >>      C131121333133313233213331333133313331333133313231333132313131222   >>