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(2) Except as otherwise provided, this Act shall come into operation on the twenty-fourth day of June, nineteen hundred and twenty-three, and shall continue in force until the twenty-fourth day of June, nineteen hundred and twenty-six: 
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Provided that the expiration of this Act shall not render recoverable by a landlord any rent, interest or other sum which during the continuance thereof was irrecoverable, or affect the right of a tenant to recover any sum which during the continuance thereof was under this Act recoverable by him. 
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