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SHARYGIN 2019 Problem 15

    The incircle ω\omega of triangle ABCABC touches the sides BCBC , CACA and ABAB at points DD , EE and FF respectively. The perpendicular from EE to DFDF meets BCBC at point XX , and the perpendicular from FF to DEDE meets BCBC at point YY . The segment ADAD meets ω\omega for the second time at point ZZ . Prove that the circumcircle of the triangle XYZXYZ touches ω\omega .

    Dataset text AI-MO AoPS. Quoted with source.

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