chapter 4 update

[Jon Lapham]

Chapter 4 Changes:

-Initial rewrite :)
-Rebuilt all the images

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  Jon Lapham  <lapham at extracta.com.br>          Rio de Janeiro, Brasil
  Work: Extracta Moléculas Naturais SA     http://www.extracta.com.br/
  Web: http://www.jandr.org/
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