    Sentence :4: Blue chips edged jower by  midday ‘or Wednesday os a: wave: of  profit: warnings drained some: of ‘the  optimism that-has driven.a'rally:over    the past. three months: 3    Sentence.:.2: U.S. Stocks’ fell. sin. sarly:  MOrning: trade “ori Wednesday as).  wave of. profit warnings drained some  of the optimism that-has driven o rally  over the past three-months.. a    A