C131121333133313233213331333133313331333131133133313331333131211113313231123231   >>    C13112133313331323321333133313331333133313113313331333133313121111331323112323   <<    C131121333133313233213331333133313331333131133133313331333131211113313231123233   >>      C131121333133313233213331333133313331333131133133313331333131211113313231123232   >>