CLHS: Section 3.2.4.2.1

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## 3.2.4.2.1 Similarity of Aggregate Objects

Of the types over which similarity is defined, some are treated as aggregate objects. For these types, similarity is defined recursively. We say that an object of these types has certain ``basic qualities'' and to satisfy the similarity relationship, the values of the corresponding qualities of the two objects must also be similar.

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