D1212132333132233131113231313231333131323223313232313231312312121   >>    D121213233313223313111323131323133313132322331323231323131231212   <<    D1212132333132233131113231313231333131323223313232313231312312123   >>      D1212132333132233131113231313231333131323223313232313231312312122   >>