C131121333133313233213331333133313331333133313331333133313331333211231232311   >>    C13112133313331323321333133313331333133313331333133313331333133321123123231   <<    C131121333133313233213331333133313331333133313331333133313331333211231232313   >>      C131121333133313233213331333133313331333133313331333133313331333211231232312   >>