pan="3" width="100%"><a href="r5rs-5.html#Other-notations">Other notations</a></td></tr>
 <tr><td valign="top" align="left">3</td><td colspan="4" width="100%"><a href="r5rs-6.html#Basic-concepts">Basic concepts</a></td></tr>
 <tr><td></td><td valign="top" align="left">3.1</td><td colspan="3" width="100%"><a href="r5rs-6.html#Variables;-syntactic-keywords;-and-regions">Variables; syntactic keywords; and regions</a></td></tr>
 <tr><td></td><td valign="top" align="left">3.2</td><td colspan="3" width="100%"><a 