text: # closures
  
  def f(x):
      y = 2 * x
      def g(z):
          return y + z
      return g
  
  print(f(1)(1))
  
  x = f(2)
  y = f(3)
  print(x(1), x(2), x(3))
  print(y(1), y(2), y(3))
  print(x(1), x(2), x(3))
  print(y(1), y(2), y(3))
  
  print("PASS")