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An early Twitter investor appeared to mock Elon Musk in a letter posted on the site on Tuesday. Leonidas Raisini said he'd sell his shares if Musk turns down his offer to buy the company for $14.3 billion. The letter includes a lot of the phrasing used by Musk when he offered to buy Twitter in April.An early Twitter investor appeared to mock new owner Elon Musk by threatening to sell his...