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  1. or download this
    # functionally speaking, this....
%hash = ('a' => 1, 'b' => 2, 'c' => 3);
...

# is the same as this...
myfunc('a', 1, 'b', 2, 'c', 3);
  2. or download this
    $scalar = 'blue';
%hash = ('a' => 1, 'b' => 2);
...
  my %hash = @_;
  print $hash{'a'};
}
  3. or download this
    %hash = ('a' => 1, 'b' => 2);
$scalar = 'blue';
...
  my($hashref,$scalar) = @_;
  print $hashref->{'a'};
}