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OLYMPIC-REVENGE 2021 Problem 3

    Let I,C,ωI, C, \omega and Ω\Omega be the incenter, circumcenter, incircle and circumcircle, respectively, of the scalene triangle XYZXYZ with XZ>YZ>XYXZ > YZ > XY . The incircle ω\omega is tangent to the sides YZ,XZYZ, XZ and XYXY at the points D,ED, E and FF . Let SS be the point on Ω\Omega such that XS,CIXS, CI and YZYZ are concurrent. Let (XEF)∩Ω=R(XEF) \cap \Omega = R , (RSD)∩(XEF)=U(RSD) \cap (XEF) = U , SU∩CI=NSU \cap CI = N , EF∩YZ=AEF \cap YZ = A , EF∩CI=TEF \cap CI = T and XU∩YZ=OXU \cap YZ = O .

    Prove that NARUTONARUTO is cyclic.

    Dataset text AI-MO AoPS. Quoted with source.

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