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  1. or download this
    my @list = qw/a b c d d a e b a b d e f/;
    my @uniq = keys %{{ map {$_ => 1} @list }};
    ...
    
    a b c d d a e b a b d e f
    e f a b c d
    
  2. or download this
    map { $_ => 1 } @list
    
  3. or download this
    { map { $_ => 1 } @list }
    
  4. or download this
    keys %{ { map { $_ => 1 } @list } }