https://en.m.wikipedia.org/wiki/Cartesian_product
2 elements create something different.
For example 2 or 3 elements that create Pesto sauce
2 notes eg F (Fa) and E (Mi) together that create the color of major 7th in music. F bass, E somewhere high in frequency, the third added (A).
The brilliant and magical song without words Great Gig in the Sky - Pink Floyd is full of such combinations or chords called major sevenths, eg Fa La Do Mi, Do Mi Sol Si.
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