Updated version of my "Practical AI Programming in Java" free web book

A download link is on the Open Content page on my main web site.

I re-worked the chapter on Hidden Markov Models, added a chapter based on Paul Graham's 'Plan for SPAM' ideas (with his permission), and converted the manuscript to Open Document Format (using OO2 version 2).

As always, please email me if you see any typos or other errors.

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