(Program
  (Hash
    (Method
      (Empty)
      (Empty)
      (Empty)
      (Empty)
      (Empty)
    { (Identifier)
    ->(Identifier) }
      (RequiredParameter
        (Empty)
        (Empty)
        (Empty)
        (Assignment
          (Identifier)
          (Empty)))
      (RequiredParameter
        (Empty)
        (Empty)
        (Empty)
        (Assignment
          (Identifier)
          (Empty)))
      (
        (Return
        { (Minus
          {-(Identifier)-}
          {-(Identifier)-})
        ->(Plus
          {+(Identifier)+}
          {+(Identifier)+}) })))))