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		 An earlier shot confirms that the 4th piece is a triangle. 
 
My first instinct is that we're looking at die face shapes.  So the square would be 6 (a d-6 having square sides).  The triangles would be d-8, d-20, and d-4.  So those 4 pieces we see would be put on 4, 6, 8, and 20 
		
	
		
		
		
		
			
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