The market’s snapback rebound remained in good shape Wednesday with an hour left in the trading day. Meanwhile, a few breakouts gained traction. The S&P 500, which took a 1% dive on Wednesday, rallied 0.9%. The Dow industrials were up 0.7%. The Nasdaq, down 1.1% in heavier trading on Tuesday, rose 1.3%. Volume was tracking nearly 11% lower on the NYSE and just mildly down on the Nasdaq exchange, according to preliminary data.