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    my @nodevalues= map { [ @{$_} ] } @{$_[2]};

$VAR1 = [
          [
...
            'f'
          ]
        ];

$VAR1 = [
          [
...
            'f'
          ]
        ];

    $node="";
    @parents=(); 
...
    $string="";
    @temp=();
    $s="";