C13112133313331323321333133313331333133313331311331333121111131133233213221   >>    C1311213331333132332133313331333133313331333131133133312111113113323321322   <<    C13112133313331323321333133313331333133313331311331333121111131133233213223   >>      C13112133313331323321333133313331333133313331311331333121111131133233213222   >>