@utils.requires_login<EOL><INDENT>def place_orders(self, market_id, instructions, customer_ref=None):<DEDENT>
return self.make_api_request(<EOL>'<STR_LIT>',<EOL>'<STR_LIT>',<EOL>utils.get_kwargs(locals()),<EOL>model=models.PlaceExecutionReport,<EOL>)<EOL>
Place new orders into market. This operation is atomic in that all
        orders will be placed or none will be placed.

        :param str market_id: The market id these orders are to be placed on
        :param list instructions: List of `PlaceInstruction` objects
        :param str customer_ref: Optional order identifier string