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  1. or download this
    use Foo::Bar;
    
    ...
      require Foo::Bar;
      Foo::Bar->import(...);
    };
    
  2. or download this
    use Foo::Bar ();
    
    ...
    BEGIN {
      require Foo::Bar;
    };
    
  3. or download this
    Algorithm::LUHN->import();
    Algorithm::LUHN->import(qw/is_valid/);
    
  4. or download this
    Algorithm::LUHN->import(qw/is_valid/);
    
  5. or download this
    Algorithm::LUHN->import(qw/ :validity /);