D1212132333132233131312323131323132322331323133313113313231331123232211   >>    D121213233313223313131232313132313232233132313331311331323133112323221   <<    D1212132333132233131312323131323132322331323133313113313231331123232213   >>      D1212132333132233131312323131323132322331323133313113313231331123232212   >>