The Language Codes

B1    Basque: there are actually seven      I     Italian Group                         

varieties                                                                               

C     Celtic Group                          I1  Piedmontese                             

C1  Scottish                                I2  Ligurian                                

C2  Welsh                                   I3  Milanese                                

C3  Breton                                  I4  Venetian                                

C4  Irish                                   I5  Tuscan                                  

C5  Cornish                                 I6  Central Italian                         

C6  Manx                                    I7  Neapolitan                              

D     Dutch Group                           H     Hispanic Group                        

D1  Dutch                                   H1  Catalan                                 

D2  Flemish                                 H2  Aragonese                               

E     English Group                         H3  Castillian                              

E1  North Country                           G     German Group                          

E2  Southern                                G1  Rhenish                                 

E3  Anglo-Scots                             G2  Swabian                                 

F     French Group                          G3  Swiss                                   

F1  Langue d'Oil: we could go further                                                   

F2  Burgundian                                                                          

F3  Langue d'Oc: we could go further                                                    

F4  Bearnese                                                                            

F5  Gascon