Consider two circles with centers A and B. Call A', A'' the two intersections of the line AB and the circle centered at A. Similarly, construct B', B''. Call X and Y the intersections of circles (A), (B) with another circle passing through A'', B''. Let another circle passing through A'', B'' be intersected by both circles (A), (B) at Z, W, respectively.
Prove that XYWZ is cyclic.
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