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  sub wanted { 
      print "$File::Find::dir/$hold\n" 
          if /\.(\w+)$/ and exists $exts{ lc $1 };
  }

  my %already_seen;

  sub wanted { 
...
          if /\.(\w+)$/ and exists $exts{ lc $1 } 
          and not $already_seen{ $File::Find::dir }++;
  }