(Program
  (Package
    (Identifier))
  (Function
    (Empty)
    (Identifier)
    ([])
    (
      (Call
        (Identifier)
        (SendChannel
          (Identifier))
        (Empty))
      (Call
        (Identifier)
        (
          (SendChannel
            (Identifier))
          (Minus
            (Identifier)
            (Identifier)))
        (Empty))
      (Call
        (Identifier)
        (
          (SendChannel
            (Identifier))
          (Integer)
          (Integer))
        (Empty))
      (Call
        (Identifier)
        (Map
          (Identifier)
          (Identifier))
        (Empty)))))