C131121333133313233213331333133313331333133313231323221323323221   >>    C13112133313331323321333133313331333133313331323132322132332322   <<    C131121333133313233213331333133313331333133313231323221323323223   >>      C131121333133313233213331333133313331333133313231323221323323222   >>