%%% The codes that you should decode:

base() ->
 ".- .-.. .-.. ..-- -.-- --- ..- .-. ..-- -... .- ... . ..-- .- .-. . ..-- -... . .-.. --- -. --. ..-- - --- ..-- ..- ... ".


rolled() ->    
    ".... - - .--. ... ---... .----- .----- .-- .-- .-- .-.-.- -.-- --- ..- - ..- -... . .-.-.- -.-. --- -- .----- .-- .- - -.-. .... ..--.. ...- .----. -.. .--.-- ..... .---- .-- ....- .-- ----. .--.-- ..... --... --. .--.-- ..... ---.. -.-. .--.-- ..... .---- ".


%%% The decoding tree.

decode_table() ->
 {node,na,
      {node,116,
            {node,109,
                  {node,111,
                        {node,na,{node,48,nil,nil},{node,57,nil,nil}},
                        {node,na,nil,{node,56,nil,{node,58,nil,nil}}}},
                  {node,103,
                        {node,113,nil,nil},
                        {node,122,
                              {node,na,{node,44,nil,nil},nil},
                              {node,55,nil,nil}}}},
            {node,110,
                  {node,107,{node,121,nil,nil},{node,99,nil,nil}},
                  {node,100,
                        {node,120,nil,nil},
                        {node,98,nil,{node,54,{node,45,nil,nil},nil}}}}},
      {node,101,
            {node,97,
                  {node,119,
                        {node,106,
                              {node,49,{node,47,nil,nil},{node,61,nil,nil}},
                              nil},
                        {node,112,
                              {node,na,{node,37,nil,nil},{node,64,nil,nil}},
                              nil}},
                  {node,114,
                        {node,na,nil,{node,na,{node,46,nil,nil},nil}},
                        {node,108,nil,nil}}},
            {node,105,
                  {node,117,
                        {node,32,
                              {node,50,nil,nil},
                              {node,na,nil,{node,63,nil,nil}}},
                        {node,102,nil,nil}},
                  {node,115,
                        {node,118,{node,51,nil,nil},nil},
                        {node,104,{node,52,nil,nil},{node,53,nil,nil}}}}}}.


%%% The codes in an ordered list.

codes() ->
    [{32,"..--"},
     {37,".--.--"},
     {44,"--..--"},
     {45,"-....-"},
     {46,".-.-.-"},
     {47,".-----"},
     {48,"-----"},
     {49,".----"},
     {50,"..---"},
     {51,"...--"},
     {52,"....-"},
     {53,"....."},
     {54,"-...."},
     {55,"--..."},
     {56,"---.."},
     {57,"----."},
     {58,"---..."},
     {61,".----."},
     {63,"..--.."},
     {64,".--.-."},
     {97,".-"},
     {98,"-..."},
     {99,"-.-."},
     {100,"-.."},
     {101,"."},
     {102,"..-."},
     {103,"--."},
     {104,"...."},
     {105,".."},
     {106,".---"},
     {107,"-.-"},
     {108,".-.."},
     {109,"--"},
     {110,"-."},
     {111,"---"},
     {112,".--."},
     {113,"--.-"},
     {114,".-."},
     {115,"..."},
     {116,"-"},
     {117,"..-"},
     {118,"...-"},
     {119,".--"},
     {120,"-..-"},
     {121,"-.--"},
     {122,"--.."}].