D12121323331322331311132313132313331323221123313231333112312121   >>    D1212132333132233131113231313231333132322112331323133311231212   <<    D12121323331322331311132313132313331323221123313231333112312123   >>      D12121323331322331311132313132313331323221123313231333112312122   >>