C131121333133313233213331333133313331312111133133313331333133313331331123123131   >>    C13112133313331323321333133313331333131211113313331333133313331333133112312313   <<    C131121333133313233213331333133313331312111133133313331333133313331331123123133   >>      C131121333133313233213331333133313331312111133133313331333133313331331123123132   >>