(Program
  (Package
    (Identifier))
  (Function
    (Empty)
    (Identifier)
    ([])
    (Assignment
      (Identifier)
      (Composite
        (Array
          (Identifier))
        (
        { (Integer)
        ->(Integer) }
        {+(Integer)+}
        { (Integer)
        ->(Integer) }
        {-(Integer)-})))))