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Sources said Citigroup Inc was selling its entire stake in HDFC, India's top mortgage lender. At 9:17 a.m. (0347 GMT), the main 30-share BSE stock index was up 0.33 percent at 18,141.36, with 26 of its components gaining. The broader 50-share NSE index was up 0.40 percent at 5,504.75.