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Since uncovering the MPSC exam scam in the beginning of the year, the Byculla police are still discovering just how deep the racket goes. After arresting the kingpin, Narasappa Birasdar (Latur-based talati), the cops suspect he may have been running the racket for four years. Aspirants paid as much as R10 lakh to dummy candidates to help them clear the exam. The cops have arrested six accused so far.