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Equity benchmark indices rebounded on Thursday, with Nifty hitting its fresh all-time high and Sensex surging more than 500 points as investors went on a buying spree in IT, automobile and technology stocks. After starting off on a volatile note, the equity market staged a recovery in the second half of the day, especially after 2.30 pm as the 30-share benchmark Sensex soared 535.15 points or 0.74 per cent to close at 73,158.24 points.