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Slack falls 15% on slowing growth. Lululemon Athletica\\u2019s digital sales in the 2nd\\xa0quarter rose 155% but Wall Street isn\\u2019t impressed. Casey\\u2019s General Stores hits an all-time high after strong 1st-quarter results. Jason Moser analyzes those stories and shares the two stocks that he and Matt Frankel just bought.
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