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  1. or download this
    {
    my $x = 20;
...

--output:--
20           #…yet the sub can still see $x
  2. or download this
    use threads;
use threads::shared;
...

--output:--
20
  3. or download this
    use threads;
use threads::shared;
...

--output:--
<blank line>    #but the thread can't see $x