C131121333133313233213331333133313331333133313331321123231121211   >>    C13112133313331323321333133313331333133313331333132112323112121   <<    C131121333133313233213331333133313331333133313331321123231121213   >>      C131121333133313233213331333133313331333133313331321123231121212   >>