(Program
  (Module
    (Identifier))
  (Function
    (Empty)
    (Identifier)
    ([])
    (
      (Assignment
        (Identifier)
        (Composite
          (Slice
            (Identifier))
          (
          {+(TextElement)+})))
      (Assignment
        (Identifier)
        (Composite
          (Slice
            (Identifier))
          (
          { (TextElement)
          ->(TextElement) })))
      (Assignment
        (Identifier)
        (Composite
          (Slice
            (Identifier))
          (
          { (TextElement)
          ->(TextElement) }
          { (TextElement)
          ->(TextElement) }))))))