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       FcCharSetUnion - Add charsets
       #include <fontconfig.h>
       FcCharSet * FcCharSetUnion (const FcCharSet *a, const FcCharSet *b);
       Returns a set including only those chars found in either a or b.
       Fontconfig version 2.2.0
                                 21 April 2003               FcCharSetUnion(3)