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If I want to describe these two representations, what should I say about the first and what about the second one?

Venn diagrams

My idea is that the first a three separate sets and the third one is the union, is it right?

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    I think @Arturo has the right idea. If the letters in the first diagram were relabelled $A',B',C'$, etc. then they would be five subsets of $\{A,B,C,D,E\}$, and the picture on the right is sort of a spatial depiction of how these sets overlap. OP asking us what he "should" say about them is a vague question still.2011-09-05

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The graphs are identical. The first diagram shows inclusion of the elements without visual representation of the mutually inclusive elements of the sets. The second diagram shows an overlapping Venn Diagram.

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    None that I know off. It's just difference in visual representation.2011-09-05