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