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

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Text this: Several classes of permutation polynomials of the form (xpm − x + δ)s + x over Fp2m