Where a jurisdiction implements a practice or procedure periodically or upon certain established contingencies, a change occurs:

(a) The first time such a practice or procedure is implemented by the jurisdiction,

(b) When the manner in which such a practice or procedure is implemented by the jurisdiction is changed, or

(c) When the rules for determining when such a practice or procedure will be implemented are changed.

The failure of the Attorney General to object to a recurrent practice or procedure constitutes preclearance of the future use of the practice or procedure if its recurrent nature is clearly stated or described in the submission or is expressly recognized in the final response of the Attorney General on the merits of the submission.