D12121323331322331313232223132313231323133313223313231313221211   >>    D1212132333132233131323222313231323132313331322331323131322121   <<    D12121323331322331313232223132313231323133313223313231313221213   >>      D12121323331322331313232223132313231323133313223313231313221212   >>