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  ______     ___      ______     ___       _____  
 /_   _//   / _ \\   /_   _//   / _ \\    / ___// 
   | ||    | / \ ||    | ||    | / \ ||   \___ \\ 
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 /__//      \___//   /__//      \___//   /____//  
 `--`       `---`    `--`       `---`   `-----`

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Text this: IRS-assisted secure UAV transmission via joint trajectory and beamforming design