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Shares of integrated marketing services firm RK Swamy made a weak debut on the bourses on Tuesday with a 13 per cent discount against the issue price of Rs 288. The stock started the trade at Rs 250 on the NSE, a discount of 13.19 per cent over the issue price of Rs 288. On the BSE, the scrip of the company debuted at Rs 252, down 12.5 per cent against the issue price.