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  1. or download this
    sub foo {
    my $array_reference = shift;
...
bar(@a2);
# bar($a3); # Can't do that because it would be a runtime error. 
bar(@$a3);
  2. or download this
    my $subref = \&bar; 
$subref->(@a1);    # Doesn't act like bar(@a1)...