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<img border="0" src="images/9_25_2.gif" align = left width="346" height="130">在图２（b）中的串联语句的规则有点微妙，由语句S=S1；S2产生的定值集合是什么？<p>
解析：首先，如果定值d由S2产生，那么它肯定由S产生；另外，如果d由S1产生，只要它不被S2注销，它也将到达S的结束点。所以我们认为: </p>
<p><span style="FONT-SIZE: large">gen[S]= gen[S2]∪(gen[S1]-kill[S2])</span></p>
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