class="lineno">   60</span>&#160;  <span class="comment">// This is private since the implementation assumes that the list of</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;  <span class="comment">// primes only grows and no prime is ever modified or removed.</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160; </div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="keyword">public</s