C131121333133313233213331333133313331333133313331333133313123223211111313231   >>    C13112133313331323321333133313331333133313331333133313331312322321111131323   <<    C131121333133313233213331333133313331333133313331333133313123223211111313233   >>      C131121333133313233213331333133313331333133313331333133313123223211111313232   >>