Spider diagram

The points indicate the existence of an attribute described by the intersection of contours in the Euler diagram.

These points may be joined forming a shape like a spider.

Joined points represent an "or" condition, also known as a logical disjunction.

In the image shown, the following conjunctions are apparent from the Euler diagram.

In the universe of discourse defined by this Euler diagram, in addition to the conjunctions specified above, all of the sets from A through G, except for C, are available separately.