better wording

Author: pchampin

index.html

@@ -1311,9 +1311,9 @@ <h3>Algorithm</h3>
                   and no further processing is necessary.</li>
               </ol>
             </li>
-            <li>Create a <a class="changed">map</a> <var>defined</var> to use to keep
+            <li>Create a <a class="changed">map</a> <var>defined</var> to keep
               track of whether or not a <a>term</a> has already been defined
-              or currently being defined during recursion.</li>
+              or is currently being defined during recursion.</li>
             <li>For each <var>key</var>-<var>value</var> pair in <var>context</var> where
               <var>key</var> is not
               <code>@base</code>,