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  1. or download this
    package common;
require common::sense;
*import = sub { $code = common::sense->can('import') and goto $code }
  2. or download this
    use common sense;
print $foo;
  3. or download this
    [tai@miranda (pts/0) ~]$ perl -Ilib example.pl
Global symbol "$foo" requires explicit package name at example.pl line
+ 2.
Execution of example.pl aborted due to compilation errors.