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 The very end of plate tracery 
 Symmetry symbol: 4mm Symmetry symbol Schoenflies: C4v Symmetry absolute number: 5 
 Symmetry comment: 4mm composition with 'open' circles at the lower end breaking the monotony of circular symmetry but retaining 4mm  | 
		
			 Lincoln, Cathedral 
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Photograph by: Painton Cowen