(Statements
  (Package
    (Identifier))
  (Function
    (Identifier)
    (Statements))
  (Function
    (Identifier)
    (Call
      (Identifier)
      (Statements)
      (Empty)))
  (Function
    (Identifier)
    (Statements
      (Call
        (Identifier)
        (Statements)
        (Empty))
      (Call
        (Identifier)
        (Statements)
        (Empty))))
  (Function
    (Identifier)
    (Statements
      (Call
        (Identifier)
        (Statements)
        (Empty))
      (Call
        (Identifier)
        (Statements)
        (Empty)))))