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  1. or download this
    my %hash3 = (%hash1, %hash2);
    my @uniq  = keys %hash3;
    
  2. or download this
    my @uniq = keys (%hash1, %hash2);
    
  3. or download this
    #! perl
    use Modern::Perl;
    ...
    my %hash2 = (homer => 'marge', fred   => 'wilma');
    my @uniq  = keys { %hash1, %hash2 };
    dd @uniq;
    
  4. or download this
    23:05 >perl 464_SoPW.pl
    ("barney", "homer", "fred")
    
    23:08 >