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@@ -166,56 +166,58 @@
 <li><a href="./">TinyExpr++ Reference Manual</a></li>
 
 <li class="divider"></li>
-<li class="chapter" data-level="1" data-path="index.html"><a href="index.html"><i class="fa fa-check"></i><b>1</b> Overview</a>
+<li class="chapter" data-level="" data-path="index.html"><a href="index.html"><i class="fa fa-check"></i>Preface</a></li>
+<li class="chapter" data-level="1" data-path="overview.html"><a href="overview.html"><i class="fa fa-check"></i><b>1</b> Overview</a>
 <ul>
-<li class="chapter" data-level="1.1" data-path="index.html"><a href="index.html#features"><i class="fa fa-check"></i><b>1.1</b> Features</a></li>
+<li class="chapter" data-level="" data-path="overview.html"><a href="overview.html#features"><i class="fa fa-check"></i>Features</a></li>
 </ul></li>
 <li class="part"><span><b>I User Guide</b></span></li>
 <li class="chapter" data-level="2" data-path="usage.html"><a href="usage.html"><i class="fa fa-check"></i><b>2</b> Usage</a></li>
 <li class="chapter" data-level="3" data-path="operators.html"><a href="operators.html"><i class="fa fa-check"></i><b>3</b> Operators</a>
 <ul>
-<li class="chapter" data-level="3.1" data-path="operators.html"><a href="operators.html#compatability-note"><i class="fa fa-check"></i><b>3.1</b> Compatability Note</a></li>
+<li class="chapter" data-level="" data-path="operators.html"><a href="operators.html#compatability-note"><i class="fa fa-check"></i>Compatability Note</a></li>
 </ul></li>
 <li class="chapter" data-level="4" data-path="functions.html"><a href="functions.html"><i class="fa fa-check"></i><b>4</b> Functions</a></li>
 <li class="chapter" data-level="5" data-path="constants.html"><a href="constants.html"><i class="fa fa-check"></i><b>5</b> Constants</a></li>
 <li class="chapter" data-level="6" data-path="comments.html"><a href="comments.html"><i class="fa fa-check"></i><b>6</b> Comments</a></li>
 <li class="part"><span><b>II Developer Guide</b></span></li>
 <li class="chapter" data-level="7" data-path="building.html"><a href="building.html"><i class="fa fa-check"></i><b>7</b> Building</a>
 <ul>
-<li class="chapter" data-level="7.1" data-path="building.html"><a href="building.html#requirements"><i class="fa fa-check"></i><b>7.1</b> Requirements</a></li>
+<li class="chapter" data-level="" data-path="building.html"><a href="building.html#requirements"><i class="fa fa-check"></i>Requirements</a></li>
 </ul></li>
 <li class="chapter" data-level="8" data-path="usage-1.html"><a href="usage-1.html"><i class="fa fa-check"></i><b>8</b> Usage</a>
 <ul>
-<li class="chapter" data-level="8.1" data-path="usage-1.html"><a href="usage-1.html#error-handling"><i class="fa fa-check"></i><b>8.1</b> Error Handling</a></li>
+<li class="chapter" data-level="" data-path="usage-1.html"><a href="usage-1.html#error-handling"><i class="fa fa-check"></i>Error Handling</a></li>
 </ul></li>
 <li class="chapter" data-level="9" data-path="examples.html"><a href="examples.html"><i class="fa fa-check"></i><b>9</b> Examples</a>
 <ul>
-<li class="chapter" data-level="9.1" data-path="examples.html"><a href="examples.html#example-1"><i class="fa fa-check"></i><b>9.1</b> Example 1</a></li>
-<li class="chapter" data-level="9.2" data-path="examples.html"><a href="examples.html#example-2-binding-custom-variables"><i class="fa fa-check"></i><b>9.2</b> Example 2: Binding Custom Variables</a></li>
-<li class="chapter" data-level="9.3" data-path="examples.html"><a href="examples.html#example-3-calling-a-free-function"><i class="fa fa-check"></i><b>9.3</b> Example 3: Calling a Free Function</a></li>
-<li class="chapter" data-level="9.4" data-path="examples.html"><a href="examples.html#example-4-non-us-formatted-formulas"><i class="fa fa-check"></i><b>9.4</b> Example 4: Non-US Formatted Formulas</a></li>
-<li class="chapter" data-level="9.5" data-path="examples.html"><a href="examples.html#example-5-binding-to-custom-classes"><i class="fa fa-check"></i><b>9.5</b> Example 5: Binding to Custom Classes</a></li>
+<li class="chapter" data-level="" data-path="examples.html"><a href="examples.html#example-1"><i class="fa fa-check"></i>Example 1</a></li>
+<li class="chapter" data-level="" data-path="examples.html"><a href="examples.html#example-2-binding-custom-variables"><i class="fa fa-check"></i>Example 2: Binding Custom Variables</a></li>
+<li class="chapter" data-level="" data-path="examples.html"><a href="examples.html#example-3-calling-a-free-function"><i class="fa fa-check"></i>Example 3: Calling a Free Function</a></li>
+<li class="chapter" data-level="" data-path="examples.html"><a href="examples.html#example-4-non-us-formatted-formulas"><i class="fa fa-check"></i>Example 4: Non-US Formatted Formulas</a></li>
+<li class="chapter" data-level="" data-path="examples.html"><a href="examples.html#example-5"><i class="fa fa-check"></i>Example 5: Binding to Custom Classes</a></li>
 </ul></li>
 <li class="chapter" data-level="10" data-path="custom-extensions.html"><a href="custom-extensions.html"><i class="fa fa-check"></i><b>10</b> Custom Extensions</a>
 <ul>
-<li class="chapter" data-level="10.1" data-path="custom-extensions.html"><a href="custom-extensions.html#binding-to-custom-functions"><i class="fa fa-check"></i><b>10.1</b> Binding to Custom Functions</a></li>
-<li class="chapter" data-level="10.2" data-path="custom-extensions.html"><a href="custom-extensions.html#binding-to-custom-classes"><i class="fa fa-check"></i><b>10.2</b> Binding to Custom Classes</a></li>
+<li class="chapter" data-level="" data-path="custom-extensions.html"><a href="custom-extensions.html#binding-to-custom-functions"><i class="fa fa-check"></i>Binding to Custom Functions</a></li>
+<li class="chapter" data-level="" data-path="custom-extensions.html"><a href="custom-extensions.html#binding-to-custom-classes"><i class="fa fa-check"></i>Binding to Custom Classes</a></li>
 </ul></li>
-<li class="chapter" data-level="11" data-path="non-us-formatted-formulas.html"><a href="non-us-formatted-formulas.html"><i class="fa fa-check"></i><b>11</b> Non-US Formatted Formulas</a></li>
-<li class="chapter" data-level="12" data-path="how-it-works.html"><a href="how-it-works.html"><i class="fa fa-check"></i><b>12</b> How it Works</a>
+<li class="chapter" data-level="11" data-path="usr.html"><a href="usr.html"><i class="fa fa-check"></i><b>11</b> Handling Unknown Variables</a></li>
+<li class="chapter" data-level="12" data-path="non-us-formatted-formulas.html"><a href="non-us-formatted-formulas.html"><i class="fa fa-check"></i><b>12</b> Non-US Formatted Formulas</a></li>
+<li class="chapter" data-level="13" data-path="how-it-works.html"><a href="how-it-works.html"><i class="fa fa-check"></i><b>13</b> How it Works</a>
 <ul>
-<li class="chapter" data-level="12.1" data-path="how-it-works.html"><a href="how-it-works.html#grammar"><i class="fa fa-check"></i><b>12.1</b> Grammar</a></li>
+<li class="chapter" data-level="" data-path="how-it-works.html"><a href="how-it-works.html#grammar"><i class="fa fa-check"></i>Grammar</a></li>
 </ul></li>
-<li class="chapter" data-level="13" data-path="compile-time-options.html"><a href="compile-time-options.html"><i class="fa fa-check"></i><b>13</b> Compile-time Options</a>
+<li class="chapter" data-level="14" data-path="compile-time-options.html"><a href="compile-time-options.html"><i class="fa fa-check"></i><b>14</b> Compile-time Options</a>
 <ul>
-<li class="chapter" data-level="13.1" data-path="compile-time-options.html"><a href="compile-time-options.html#te_pow_from_right"><i class="fa fa-check"></i><b>13.1</b> <code>TE_POW_FROM_RIGHT</code></a></li>
+<li class="chapter" data-level="" data-path="compile-time-options.html"><a href="compile-time-options.html#te_pow_from_right"><i class="fa fa-check"></i><code>TE_POW_FROM_RIGHT</code></a></li>
 </ul></li>
-<li class="chapter" data-level="14" data-path="embedded-programming.html"><a href="embedded-programming.html"><i class="fa fa-check"></i><b>14</b> Embedded Programming</a>
+<li class="chapter" data-level="15" data-path="embedded-programming.html"><a href="embedded-programming.html"><i class="fa fa-check"></i><b>15</b> Embedded Programming</a>
 <ul>
-<li class="chapter" data-level="14.1" data-path="embedded-programming.html"><a href="embedded-programming.html#performance"><i class="fa fa-check"></i><b>14.1</b> Performance</a></li>
-<li class="chapter" data-level="14.2" data-path="embedded-programming.html"><a href="embedded-programming.html#volatility"><i class="fa fa-check"></i><b>14.2</b> Volatility</a></li>
-<li class="chapter" data-level="14.3" data-path="embedded-programming.html"><a href="embedded-programming.html#exception-handling"><i class="fa fa-check"></i><b>14.3</b> Exception Handling</a></li>
-<li class="chapter" data-level="14.4" data-path="embedded-programming.html"><a href="embedded-programming.html#virtual-functions"><i class="fa fa-check"></i><b>14.4</b> Virtual Functions</a></li>
+<li class="chapter" data-level="" data-path="embedded-programming.html"><a href="embedded-programming.html#performance"><i class="fa fa-check"></i>Performance</a></li>
+<li class="chapter" data-level="" data-path="embedded-programming.html"><a href="embedded-programming.html#volatility"><i class="fa fa-check"></i>Volatility</a></li>
+<li class="chapter" data-level="" data-path="embedded-programming.html"><a href="embedded-programming.html#exception-handling"><i class="fa fa-check"></i>Exception Handling</a></li>
+<li class="chapter" data-level="" data-path="embedded-programming.html"><a href="embedded-programming.html#virtual-functions"><i class="fa fa-check"></i>Virtual Functions</a></li>
 </ul></li>
 <li class="part"><span><b>III Appendix</b></span></li>
 <li class="chapter" data-level="" data-path="references.html"><a href="references.html"><i class="fa fa-check"></i>References</a></li>
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         <div class="book-header" role="navigation">
           <h1>
-            <i class="fa fa-circle-o-notch fa-spin"></i><a href="./">TinyExpr++ Reference Manual</a>
+            <i class="fa fa-circle-o-notch fa-spin"></i><a href="./">TinyExpr++</a>
           </h1>
         </div>