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  1. or download this
    ...
$$arrayref[0] = "January";
$$hashref{"KEY"} = "VALUE"; # deref the hash, assign a key
&$coderef(1,2,3);
...
  2. or download this
    ...
${$arrayref}[0] = "January";
${$hashref}{"KEY"} = "VALUE"; # same as above, differet syntax
&{$coderef}(1,2,3);
...
  3. or download this
    $arrayref->[0] = "January";
$hashref->{"KEY"} = "VALUE"; # still the same, witha arrow operator
$coderef->(1,2,3);