Retidy, removing align=left from headings and empty paragraphs

27-04.html

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-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<!DOCTYPE html>
 
 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
@@ -19,17 +18,21 @@
   <center>
     <table border="1">
       <tr>
-        <td><a href="27-03.html">Previous</a></td>
+        <td>
+          <a href="27-03.html">Previous</a>
+        </td>
 
-        <td><a href="index.html">Table of Contents</a></td>
+        <td>
+          <a href="index.html">Table of Contents</a>
+        </td>
 
-        <td><a href="27-05.html">Next</a></td>
+        <td>
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     </table>
   </center>
 
-  <p><br /></p>
-
   <h3 id="Heading7">When to Use Write Mode 2 and When to Use Set/Reset</h3>
 
   <p>As indicated earlier, write mode 2 and set/reset are functionally interchangeable. Write mode 2 lends itself to more efficient implementations when the drawing color changes frequently, as in Listing 27.2.</p>
@@ -62,16 +65,20 @@
 
   <p>At any rate, once the graphics mode bitmap is relocated, flipping to text mode and back becomes painless. The memory used by mode 3 doesn&rsquo;t overlap the relocated mode 10H bitmap at all (unless additional portions of font memory are loaded), so all you need do is set bit 7 of AL on mode sets in order to flip back and forth between the two modes.</p>
 
-  <p><br /></p>
-
   <center>
     <table border="1">
       <tr>
-        <td><a href="27-03.html">Previous</a></td>
+        <td>
+          <a href="27-03.html">Previous</a>
+        </td>
 
-        <td><a href="index.html">Table of Contents</a></td>
+        <td>
+          <a href="index.html">Table of Contents</a>
+        </td>
 
-        <td><a href="27-05.html">Next</a></td>
+        <td>
+          <a href="27-05.html">Next</a>
+        </td>
       </tr>
     </table>
   </center>