If he uses regular rules for allowable modifiers (e.g., &quot;-er&quot; can be added to a verb that is in the base list, <i>to form a noun that is refers to the agent of the action described by the verb</i>, then &quot;filler&quot; would be allowed if &quot;fill&quot; but not &quot;filler&quot; was on the list, but only to refer to the actor who causes something to be filled, rather than thing with which something is filled.)<p>I certainly think its clear (and even implicit in his own descriptions) that the <i>exact</i> methodology is not disclosed, but I don&#x27;t think its far to say simply &quot;he cheated&quot;.