String Explorer (red book)
http://www.youtube.com/watchv=Z_Mqji7c2Ng&w=380&h=240
http://www.youtube.com/watchv=4gLNzfj8KE0&w=380&h=240
http://www.youtube.com/watchv=HJIrpguY5k0&w=380&h=240
http://www.youtube.com/watchv=61cyblwxXA4&w=380&h=240
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