What are “sums-and-products” data structures?

StackOverflow https://stackoverflow.com/questions/5911267

Question

A recent blog post on William Cook's Fusings mentions:

The key point is that structures in Ensō are viewed holistically as graphs, not as individual values or traditional sums-and-products data structures.

What are the traditional sums-and-products data structures he is referring to?

No correct solution

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