(Program
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    (Function
      (Empty)
      (Statements)))
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      (Empty)
      (Send
        (Identifier))))
  (Send
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    (Function
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      (Identifier)
      (Identifier)
      (Identifier)
      (Integer)))
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    (Function
      (Empty)
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  (Function
    (Empty)
    (Function
      (Empty)
      (Send
        (Identifier))))
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    (Function
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      (Integer)))
  (Function
    (Empty)
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    (Identifier)
    (Statements
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      (Identifier))
    (Function
      (Empty)
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