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  1. or download this
    package x;
use Exporter 'import';
our @EXPORT_OK = ('a', 'b', 'c');
  2. or download this
    #main_script
use x 'a', 'b'; # makes a() and b() available in the main namespace
  3. or download this
    #!perl -w
use strict;
...
sub foo_2 {}

use strict;