A Venn diagram shows the similarities and differences between items in a data set. The shared characteristics go in the center of the intersecting circles, and all the elements that are different ...

Rotate a two-circle Venn diagram by 180 degrees (or a three-circle one by 120 degrees), and it looks the same. But the four-ellipse diagram doesn’t have rotational symmetry.

So, diagram the A/B premise and the B/C premise onto the three circles. If what comes out when we look at the A/C circles entails the representation of the form of the conclusion, BOOM, the ...