D12121323331311132313232213231232313132313232233132313233313232211312121   >>    D1212132333131113231323221323123231313231323223313231323331323221131212   <<    D12121323331311132313232213231232313132313232233132313233313232211312123   >>      D12121323331311132313232213231232313132313232233132313233313232211312122   >>