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  1. or download this
    my $variable = 22;
my $pointer = \$variable;
...
$$$double_pointer = 50;

say "Look at that!  \$variable now equals $variable";
  2. or download this
    The address of $variable, which contains the value 22,
is SCALAR(0x801e64540)
Look at that!  $variable now equals 25
$double_pointer = REF(0x801e644b0)
Look at that!  $variable now equals 50