(Statements
  (Hash
    (Method
      (Empty)
      (Empty)
      (Empty)
      (Empty)
      (Identifier)
      (RequiredParameter
        (Empty)
        (Empty)
        (Identifier)
        (Empty))
      (RequiredParameter
        (Empty)
        (Empty)
        (Identifier)
        (Empty))
      (StatementBlock
        (Return
          (Minus
            (Identifier)
            (Identifier)))))))