Bulls trampled the bears for a second straight session Thursday, as the market made a bullish signal. The Nasdaq, S&P 500 and Dow Jones industrial average each rolled 1.8% higher. The IBD 50 added 1.6%. Volume rose on both major exchanges. Thursday’s action on the Nasdaq constituted a follow-through, which means the market is in a confirmed uptrend. Technically, the index had been making an attempted rally since Dec.