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       FcCharSetSubtractCount - Subtract and count charsets
       #include <fontconfig.h>
       FcChar32  FcCharSetSubtractCount  (const  FcCharSet *a, const FcCharSet
       *b);
       Returns the number of chars that are in a but not in b.
       Fontconfig version 2.2.0
                                 21 April 2003       FcCharSetSubtractCount(3)