b.addInstalledProduct(new ConsumerInstalledProduct("b", "Product B"));
b.addInstalledProduct(new ConsumerInstalledProduct("c", "Product C"));
Consumer c = new Consumer();
c.addInstalledProduct(new ConsumerInstalledProduct("a", "Product A"));
c.addInstalledProduct(new ConsumerInstalledProduct("c", "Product C"));
Consumer d = new Consumer();
d.addInstalledProduct(new ConsumerInstalledProduct("a", "Product A"));
d.addInstalledProduct(new ConsumerInstalledProduct("b", "Product B"));
d.addInstalledProduct(new ConsumerInstalledProduct("d", "Product D"));