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(Jen)
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hey, do you mean the twelve bar blues?  cause in its most basic form, thats: 
 
C - C - C - C - F - F - C - C - G - F - C - C 
 
most of those chords are seventh chords.  There are heaps of variations on that (ie. the F can become a B7 or the like...) but just work with the simple 12 bar blues with your blues scale. 
 
cheers 
 
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