C13131221323331323131323132323213231323131323223313233313233313232121221   >>    C1313122132333132313132313232321323132313132322331323331323331323212122   <<    C13131221323331323131323132323213231323131323223313233313233313232121223   >>      C13131221323331323131323132323213231323131323223313233313233313232121222   >>