int sqlite3Fts5UnicodeIsdiacritic(int c){
  unsigned int mask0 = 0x08029FDF;
  unsigned int mask1 = 0x000361F8;
  if( c<768 || c>817 ) return 0;
  return (c < 768+32) ?
      (mask0 & ((unsigned int)1 << (c-768))) :
      (mask1 & ((unsigned int)1 << (c-768-32)));
}