text: #!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  
  if __name__ == "__main__":
      u = set("abcdefghijklmnopqrstuvwxyz")
      a = {"a", "e", "g", "o", "p"}
      b = {"e", "h", "i", "o", "u"}
      c = {"g", "h", "p", "s", "t", "w"}
      d = {"f", "h", "n", "s", "t", "x", "y"}
  
      not_a = u - a
      not_b = u - b
  
      x = (a - c) & not_b
      y = (not_a & d) | (c - d)
  
      print(f"x = {x}")
      print(f"y = {y}")
      