C131121333133313233213331333133313331333133313113313232211211331323221312121   >>    C13112133313331323321333133313331333133313331311331323221121133132322131212   <<    C131121333133313233213331333133313331333133313113313232211211331323221312123   >>      C131121333133313233213331333133313331333133313113313232211211331323221312122   >>