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SHARYGIN 2018 Problem 7

    Let EE be a common point of circles w1w_1 and w2w_2. Let ABAB be a common tangent to these circles, and CDCD be a line parallel to ABAB, such that AA and CC lie on w1w_1, BB and DD lie on w2w_2. The circles ABEABE and CDECDE meet for the second time at point FF. Prove that FF bisects one of arcs CDCD of circle CDECDE.

    Official text Sharygin Geometry Olympiad 2018 official paper, page 2. Quoted with source.

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