Notwithstanding anything in the last preceding section when a decree or order for the enhancement of the rent of any holding is passed, and the tenant thereof within thirty days of the date of such decree or order gives to the landholder a registered notice in writing of his desire to surrender such holding at the date on which such enhancement takes effect, and surrenders such holding accordingly, he shall not be liable for the rent payable for such holding in respect of any period subsequent to such surrender.
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