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  1. or download this
        package ClientFactory;
    
...
    
    my $client = ClientFactory::genericClient();
    my $calculator = $client->getCalculator();
  2. or download this
        package Storage;
    
...
    my $client = new Client;
    my $calc = $client->getCalculator();
    $calc->calculate();
  3. or download this
        sub InvoiceCalculator::calculate {
        my $O = shift;
...
        }
        return;
    }