ine"><a name="l00081"></a><span class="lineno">   81</span>&#160;&lt;/div&gt;</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;&lt;/center&gt;&lt;p&gt;The boxes in the above graph have the following meaning: &lt;/p&gt;</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;&lt;ul&gt;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;&lt;li&gt;</div>
<div class="line"><a name="l00085"></a><span class="lineno">  