C131121333133313233213331333133313331333133313113313331211111322211232212321   >>    C13112133313331323321333133313331333133313331311331333121111132221123221232   <<    C131121333133313233213331333133313331333133313113313331211111322211232212323   >>      C131121333133313233213331333133313331333133313113313331211111322211232212322   >>