Update free-programming-books.md
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###Flex
* [Getting started with Adobe Flex](http://public.dhe.ibm.com/software/dw/db2/express-c/wiki/Getting_Started_with_Adobe_Flex_p2.pdf) (PDF)
* [Adobe Flex 2, Programming Actionscript 3.0](http://download.macromedia.com/pub/documentation/en/flex/2/prog_actionscript30.pdf)
###F Sharp