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

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Text this: Device scheduling and assignment in hierarchical federated learning for Internet of Thing