There are a couple different ways you could sign spine. A good way 
			is to indicate your "back" by using the common "A"-hand gesture. 
			Then use a couple of "G"-hands to show the spine.
			
			SPINE:
			




			
			Notes:
			It would be okay to use "F"-hands too.  The "F"-handshape would 
			work very nicely since the back is composed of round disks.
 
			
			
		
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