(Program
  (Send
    (Identifier)
    (Function
      (Empty)
      ([])))
  (Send
    (Identifier)
    (Function
      (Empty)
      (Send
        (Identifier))))
  (Send
    (Identifier)
    (Function
      (Empty)
      (Identifier)
      (Identifier)
      (Identifier)
      (Integer)))
  (Function
    (Empty)
    (Function
      (Empty)
      ([])))
  (Function
    (Empty)
    (Function
      (Empty)
      (Send
        (Identifier))))
  (Function
    (Empty)
    (Identifier)
    (Function
      (Empty)
      (Integer)))
  (Function
    (Empty)
    (Identifier)
    (Identifier)
    (
      (Identifier)
      (Identifier))
    (Function
      (Empty)
      ([]))))