77.—(1) A notice served under paragraph (1) of Article 76 shall, if no appeal is brought under paragraph (11) of that Article, become operative on the expiration of 21 days from the date of service of the notice and shall be final and conclusive as to any matters which could have been raised on such an appeal.
(2) A notice served under paragraph (1) of Article 76 against which an appeal is brought under paragraph (11) of that Article shall, if and so far as it is confirmed by the court, become operative on such date as may be specified by the court or, where no date is so specified, as from the final determination of the appeal.
(3) For the purposes of this Article, the withdrawal of an appeal shall be deemed to be the final determination thereof, having the like effect as a decision confirming the notice against which the appeal is brought.