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  1. or download this
    foreach my $category (sort { ($list->{$_}->{cat_name} cmp $list->{$_}-
    +>{cat_name}) } keys %$list) {
      say $list->{$category}{cat_name};
    }
    
  2. or download this
    Use of uninitialized value $_ in hash element at ./facebook.pl line 34
    +.
    Use of uninitialized value $_ in hash element at ./facebook.pl line 34
    +.
    Use of uninitialized value in string comparison (cmp) at ./facebook.pl
    + line 34.
    Use of uninitialized value in string comparison (cmp) at ./facebook.pl
    + line 34.
    
  3. or download this
    $list = 
    {
    ...
                                 },
    
    };