Cut(left, right, res);</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    }</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;  }</div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160; <span class="keyword">private</span>:</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;  <span class="comment">// sequential letters rule</span></div><div class="line"><a name="l00079"></a><span 