D12121323331322331311132313132313331323221123313231333112121111   >>    D1212132333132233131113231313231333132322112331323133311212111   <<    D12121323331322331311132313132313331323221123313231333112121113   >>      D12121323331322331311132313132313331323221123313231333112121112   >>