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		 Basically they are bonds where you buy them cheaper than their market value, but then you can't sell them for X number of years. 
Example: You buy a bond with a market value of 500$ for 250$ and then wait 15 years and sell it for 500$. If you need to sell it before the 15 years you take a huge hit. 
		
	
		
		
		
		
		
	
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