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    Use of uninitialized value in exists at C:\test\632320.pl line 161.
    Use of uninitialized value in null operation at C:\test\632320.pl line
    + 161.
    ...
    Use of uninitialized value in hash element at C:\test\632320.pl line 1
    +67.
    Use of uninitialized value in exists at C:\test\632320.pl line 161.
    ...
    
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        my $k;
        foreach $k ( keys %{ $hrefA } ) {
    
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        if ($result) {
            foreach (keys(%{$hrefB})) {      ## No loop variable
                if ( exists $hrefA->{$k} ) { ## line 161
    
  4. or download this
        ## my $k;
        foreach my $k ( keys %{ $hrefA } ) {
    ...
        if ($result) {
            foreach my $k (keys(%{$hrefB})) {      ## No loop variable
                if ( exists $hrefA->{$k} ) {       ## line 161