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Amazon stock has dropped 49% year-to-date but it has three levers to unlock value that make it a "Buffett buy," according to Evercore ISI.Warren Buffett's Berkshire Hathaway already owns a $1.2 billion stake in Amazon that was bought in 2019."We continue to view Amazon as highly attractive for long-term investors as a dislocated high quality stock," Evercore said.Amazon is stock a Warren Buffett could buy again because it has three clear levers to...