C313131323331311331322331322331312323221323132313331313311231231   >>    C31313132333131133132233132233131232322132313231333131331123123   <<    C313131323331311331322331322331312323221323132313331313311231233   >>      C313131323331311331322331322331312323221323132313331313311231232   >>