D1212132333132233131323222313231323133313231322331323132333132312121   >>    D121213233313223313132322231323132313331323132233132313233313231212   <<    D1212132333132233131323222313231323133313231322331323132333132312123   >>      D1212132333132233131323222313231323133313231322331323132333132312122   >>