At the stock markets, the Sensex at the Bombay Stock Exchange gained some ground in early deals, but then swung between losses and gains, and had climbed just 13 points, to 31,223 a short while ago. The Nifty at the National Stock Exchange had added 14 points, to 9,627.And at the forex market, the rupee had weakened 2 paise, to 64.76 against the dollar in afternoon deals.