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		 Oak wine barrels (half) work great. The downside is that they're not the cheapest option. On the plus side, they take up space so you don't need a lot of 'em and they can easily handle large plants and small trees. 
		
	
		
		
		
		
			
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				Is it the fingers, or the brain that you're teaching a lesson? 
			 
		
		
		
		
	
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