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Imagine writing an online shop with different types of products. Normally all products would have common attributes such as title and price . Some attributes will likely differ. Tee may have size such as S, M, or L, while a Pen could have an ink_color . It’s easy to see that Tee is a Product , and so is Pen . We are looking at an is_a relationship. When I program this type of relationship I…
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