(Statements
  (Class
    (Identifier)
    (Identifier)
    (Statements
      (Function
        (Identifier)
        (RequiredParameter
          (Identifier))
        (Statements
          (Return
            (Empty))))))
  (Class
    (Identifier)
    (Statements
      (Function
        (Identifier)
        (RequiredParameter
          (Identifier))
        (Statements
          (Return
            (Identifier))))))
  (Class
    (Identifier)
    (Identifier)
    (Statements
      (Assignment
        (Identifier)
        (Identifier)
        (Empty))
      (Assignment
        (Subscript
          (Identifier)
          (Identifier))
        (Identifier)
        (Empty)))))