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my %keys = (A => "b");
            -    ---
            1     2     List has two items

my %keys = A => "b";
------------    ---
     1           2      List still there without parens

foreach ($x) { }     @a = @b;     f $x;
         ^^          ^^   ^^        ^^
...
^^^^^^      ^^   ^^^^^^^^
 list      list  list value
literal   value  (from list literal)