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| || | ||  /_   _//  | |/ //   / _ \\  |      \\ 
| '--' ||   -| ||-   | ' //   / //\ \\ |  --  // 
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`-`  `-`   `-----`   `-` --` `-`   `-` `------`

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Text this: Secure wirelessly powered networks at the physical layer: challenges, countermeasures, and road ahead