Dear Monks

I have a file format like so: 
200326951|_|rel_Access1|_|200315482|_|
200326951|_|rel_Access1|_|200315786|_|
200326951|_|rel_Access2|_|200315482|_|
200326951|_|rel_Access2|_|200315786|_|

[download]
I want to read this file and build a hash. I have the following code: 
my %hash;


open(CMD1, "< test.txt");

while (<CMD1>) {
  my @elts = split(/\|_\|/, $_, -1);
  
  my $p = \\%hash;
  $p = \( ${$p}->{$_} ) for @elts;
}

use Data::Dumper;
print Dumper(\%hash);

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However, that gives me a hash like so: 
$VAR1 = {
  '200326951' => {
       'rel_Access2' => {
              '200315482' => {
                               '' => undef
                             },
              '200315786' => undef
            },
       'rel_Access1' => {
          '200315482' => {
                           '' => undef
                         },
          '200315786' => {
                           '' => undef
                         }
        }
     }
};

[download]
What can I do to get a hash like the following: 
$VAR1 = {
  '200326951' => {
       'rel_Access2' => '200315786' 
            },
       'rel_Access1' => '200315482' 
            }
};

[download]
Basically, I'm looking to discard duplicate values. This is a slightly tricky example, since in this one, the second line gets discarded because the second field (rel_Access1) was already present in the first line, and the third line gets discarded because the third field (200315482) was present in the result..

Many thanks!

In reply to hash from CSV-like structure by manav_gupta

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