C131121333133313233213331333133313331333131211113313113313223321   >>    C13112133313331323321333133313331333133313121111331311331322332   <<    C131121333133313233213331333133313331333131211113313113313223323   >>      C131121333133313233213331333133313331333131211113313113313223322   >>