From Aho, Hopcroft, Ullman, "Data Structures and Algorithms".

<a href="aho234.gif">pg. 234</a>,
<a href="aho235.gif">pg. 235</a>,
<a href="aho236.gif">pg. 236</a>,
<a href="aho237.gif">pg. 237</a>,
<a href="aho238.gif">pg. 238</a>,
<a href="aho239.gif">pg. 239</a>,