US STOCKS-Wall St gains on earnings; S&P up for 6th straight day
* S&P 500, Nasdaq on track for six-day advance * Netflix up after results, Facebook gains on update * Allergan soars as Ackman and Valeant bid for company * Indexes up: Dow 0.6 pct, S&P 0.5 pct, Nasdaq 0.9 pct (Updates to midday trading) By Ryan Vlastelica NEW YORK
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