{-(Program
  (ExpressionStatements
    (FunctionCall
      (Identifier)
      (NumberLiteral)
      (StringLiteral)
      (Function
        (Params
          (Other "required_parameter"
            (Identifier))
          (Other "required_parameter"
            (Identifier)))
        (ExpressionStatements
          (FunctionCall
            (Identifier)
            (Identifier)
            (Identifier)))
        (Return
          (Identifier)))
      (Boolean))))-}