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Problem 392. Triangle, Parallel lines, Collinear points, Concurrent lines.
Level: High School, SAT Prep, College geometry.

The figure shows a triangle ABC with DE parallel to AB and DF parallel to BC. AE intersects DF at G, CF intersects DE at H, AH intersects BC at J, CG intersects AB at K. Prove that lines EF, JK, and HG are concurrent,

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