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NEW YORK (AP) — U.S. stocks are drifting between gains and losses Tuesday as Wall Street debates whether the market’s strong recent run is the start of a turnaround or a temporary blip. The S&P 500 was 0.2% lower in afternoon trading. The Nasdaq was clinging to a small gain, but the Dow was falling following a disappointing report on revenue from Caterpillar. Treasury yields climbed as concerns over the first visit by a U.S. Speaker of the House to Taiwan in 25 years eased.