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        Problem 72. Intersecting Circles, 
		  Common Chord, Cyclic Quadrilateral, Angles, 
		Parallel.
		Level: High School, SAT Prep, College geometry. 
      In the figure below, the circles O and Q intersect at C an D. BF is a 
	  line through C and AE is a line through D. Prove that lines AB and EF are 
	  parallel. 
                
				 
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