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  1. or download this
    package Hunting::Snark;
use Bellman qw(foo bar);
...

foo(); # is an undefined subroutine. There is no &Boojum::foo
  2. or download this
    ...
package Boojum;
use Bellman qw(foo bar);

foo(); # &Boojum::foo is now defined. aliased to &Bellman::foo