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#!/usr/bin/perl
$foo = 'bar';
$baz = 'qux';

#!/usr/bin/perl
use strict;
$main::foo = 'bar';
$main::baz = 'qux';

#!/usr/bin/perl
use strict;
$main::foo = 'bar';
$main::baz = 'qux';
$main::foo .= $main::bza;

#!/usr/bin/perl
use strict;
...
$foo = 'bar';
$baz = 'qux';
$foo .= $bza;