5. The method of claim 1 , wherein the determining of a character sub-string comprises: identifying space characters in the input character string; and on basis of a substring directly succeeding a space character and directly preceding the unrecognized character, determining a character sub-string.
5. The method of claim 1 , wherein the determining of a character sub-string comprises: identifying space characters in the input character string; and on basis of a substring directly succeeding a space character and directly preceding the unrecognized character, determining a character sub-string. 6. The method of claim 5 , wherein a character sub-string is determined consisting of the terminal character sub-string of the input character string preceding the unrecognized character and succeeding an identified last space character before the unrecognized character.