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use strict;
use warnings;
...
package Szyewicki;

print "Here at work, 'Robert' is $Robert, but over at the pool hall, '
+Robert' is $PoolHall::Robert\n";

Here at work, 'Robert' is the darts expert, but over at the pool hall,
+ 'Robert' is the darts expert

use strict;
use warnings;
...

our ($Robert);
print "Here at work, 'Robert' is $Robert, but over at the pool hall, '
+Robert' is $PoolHall::Robert\n";