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BALTIC-WAY 2024 Problem 14

    Let ABCA B C be an acute triangle with circumcircle ω\omega. The altitudes AD,BEA D, B E and CFC F of the triangle ABCA B C intersect at point HH. A point KK is chosen on the line EFE F such that KH∥BCK H \| B C. Prove that the reflection of HH in KDK D lies on ω\omega.

    Dataset text NuminaMath olympiads. Quoted with source.

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