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OLYMPIC-REVENGE 2018 Problem 4

    Let △ABC\triangle ABC an acute triangle of incenter II and incircle ω\omega . ω\omega is tangent to BC,CABC, CA and ABAB at points TA,TBT_{A}, T_{B} and TCT_{C} , respectively. Let lAl_{A} the line through AA and parallel to BCBC and define lBl_{B} and lCl_{C} analogously. Let LAL_{A} the second intersection point of AIAI with the circumcircle of △ABC\triangle ABC and define LBL_{B} and LCL_{C} analogously. Let PA=TBTC∩lAP_{A}=T_{B}T_{C}\cap l_{A} and define PBP_{B} and PCP_{C} analogously. Let SA=PBTB∩PCTCS_{A}=P_{B}T_{B}\cap P_{C}T_{C} and define SBS_{B} and SCS_{C} analogously. Prove that SALA,SBLB,SCLCS_{A}L_{A}, S_{B}L_{B}, S_{C}L_{C} are concurrent.

    Dataset text AI-MO AoPS. Quoted with source.

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