C13131221323331323131323132323213231323131323223313233313232213231231211   >>    C1313122132333132313132313232321323132313132322331323331323221323123121   <<    C13131221323331323131323132323213231323131323223313233313232213231231213   >>      C13131221323331323131323132323213231323131323223313233313232213231231212   >>