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       FcPatternHash - Compute a pattern hash value
       #include <fontconfig.h>
       FcChar32 FcPatternHash (const FcPattern *p);
       Returns  a  32-bit  number which is the same for any two patterns which
       are equal.
       Fontconfig version 2.2.0
                                 21 April 2003                FcPatternHash(3)