C131121333133313233213331333133313331333133313331333133313331333211231311311   >>    C13112133313331323321333133313331333133313331333133313331333133321123131131   <<    C131121333133313233213331333133313331333133313331333133313331333211231311313   >>      C131121333133313233213331333133313331333133313331333133313331333211231311312   >>