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Market preview: Stock futures pare small earlier gains to trade flat after the ADP jobs report missed forecasts and as investors remain wary ahead of nonfarm payrolls on Friday. With the S&P Mini at 1564.75, the index remains tantalizingly close to its all-time record of 1,576.09 - as it has done for the past few sessions. Zynga zings 12% after saying it will offer gambling products in Britain, but ConAgra drops 2.2% following its earnings. Later: ISM Non-Manufacturing Index, Fed's Williams.