nterlocutor on a topic of
&gt; graph theory is a native speaker of the GT or the ST family
&gt; of dialects.  Simply ask your informant to provide you with
&gt; an "example of a graph", in a setting, of course, where the
&gt; free choice of an illustrative medium is not so constrained
&gt; as to bias the freedom of exemplary expression.
&gt; 
&gt; If your informant responds with an unadorned figure like this:
&gt; 
&gt; |              o
&gt; |             /|\
&gt; |            / | \
&gt; |           /  |  \