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foreach $k(sort {$match{$a}<=>$match{$b}} keys %match}

I get an error, "Can't use "my $b" in sort comparison at D:\db\New\est
+_keywords.pl line 41."

    foreach $word(sort byval keys %match)
    {
...
{
    return $match{$b} <=> $match{$a};
}