C131121333133313233213331333133313331333133313331311132313231231   >>    C13112133313331323321333133313331333133313331333131113231323123   <<    C131121333133313233213331333133313331333133313331311132313231233   >>      C131121333133313233213331333133313331333133313331311132313231232   >>