Text this: The capacity regions of some classes of deterministic relay channels

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