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

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Text this: Angle-selective surface based on multi-layered frequency-selective surfaces