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  1. or download this
    #!/usr/bin/env perl
use v5.14;
...
  say $var;
}
say $var;
  2. or download this
    use v5.14;

...

set("Hello world");
say $global;
  3. or download this
    $Foo::Bar::monkey  = 'capuchin';
@Foo::Bar::monkies = qw( capuchin howler spider );
...
);

$::Hello = "World";  # is an alias for $main::Hello
  4. or download this
    {
  package Foo::Bar;
...
  say $monkey;   # blank line (it's undefined)
  say $Foo::Bar::monkey;
}