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for my $key ( keys %hosts ) {
    if ( $hosts{$key} != $table_count ) {
        delete $hosts{$key};
    }
}

while ( my ($key,$value) = each %hosts) {
    delete $hosts{$key}
      if $value != $table_count;
}

while (($key, $value) = each %hash) {
    print $key, "\n";
    delete $hash{$key};   # This is safe
}