 be Number 14 from the above lists.
The current definition is Number 15, and I will confess that I find some aspects
of it confusing to me, still, but I like it especially because of the &quot;sunflower&quot;
illustration, which was critical to piquing my interest in the subject many years
ago, partly because it made a connection in my mind to the way that I used to view
group theory in those days.

To represent a 3-tuple &lt;x, y, z&gt; such that xy = z in a group G,
I used to draw a picture of something l