ogy, e.g., the relations "exists-at" and 
&gt; "located-at".)
&gt; &gt;  A person's lifetime, for example, is an occurrent.  Different stages 
&gt; of a life
&gt; &gt;  cannot be reliably identified unless some continuant, such as the person's
&gt; &gt;  fingerprints or DNA, is recognized by suitable identity conditions at 
&gt; each stage.
&gt; &gt;  Even then, the identification depends on an inference that presupposes 
&gt; the uniqueness
&gt; &gt;  of the identity conditions.")
&gt; &gt;
&gt; &gt; (docu