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  1. or download this
      package foo;
  BEGIN { print "foo's BEGIN\n"; }
...
    print "foo's import: @_\n";
  }
  1;
  2. or download this
      package bar;
  use foo qw(from bar);
  1;
  3. or download this
      use lib '.';
  use foo qw(from test.pl);
  use foo qw(from test.pl again);
  use bar;
  4. or download this
      $ perl test.pl
  foo's BEGIN
...
  foo's import: from test.pl again
  foo's import: from bar
  $