(Program
  (Module
    (Identifier))
  (Function
    (Identifier)
    (Args))
  (Function
    (Identifier)
    (Args)
    (FunctionCall
      (Identifier)))
  (Function
    (Identifier)
    (Args)
    (FunctionCall
      (Identifier))
    (FunctionCall
      (Identifier)))
  (Function
    (Identifier)
    (Args)
    (FunctionCall
      (Identifier))
    (FunctionCall
      (Identifier))))