D121213233313133313123132313231323221323132322331322331313231211   >>    D12121323331313331312313231323132322132313232233132233131323121   <<    D121213233313133313123132313231323221323132322331322331313231213   >>      D121213233313133313123132313231323221323132322331322331313231212   >>