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Language-Related-Issues.html#Language-Related-IssuesLanguage Related Issues C.3 Unicode Normalization
Because Unicode contains a large number of precomposed characters there
are multiple ways a character can be represented.  For example letter
ö can either be represented as
     U+00F6 LATIN SMALL LETTER O WITH DIAERESIS
or     U+0061 LATIN SMALL LETTER O + U+0308 COMBINING DIAERESIS
   
By performing normalization first, Aspell will only see one of these
representations.  The exact form of normalization depends on the
language.  Give the choice of:
     
Precomposed character
Base letter + combining character(s)
Base letter only
        
if the precomposed character is in the target character set, then (1),
if both base and combining character is present, then (2), otherwise (3).
   
Unicode Normalization is now implemented in Aspell 0.60.
   
