Added Categories

I have categorized posts all posts from 2004 and 2005. All that remains is to do the same for 2006. The only issue is that '04-'05 have a total of 103 posts, whereas 2006 encompasses 539 posts, so far!
I will try to do about a month each day until they're done.

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Thanks for reading TDA Training!
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Update: Now categorized through February 2006