66Moreover, such an interpretation makes it possible to take into account both the wording and the objective of Article 4 of the Schengen Protocol, since the flexibility thus given by Article 5 of that protocol to the two Member States concerned as regards their free choice whether or not to join in measures implementing and developing the Schengen acquis is capable of overcoming their possible reluctance, in the absence of such a choice, to accept provisions of the Schengen acquis, and of thereby encouraging them to make as much use as possible of the possibility reserved to them by Article 4.
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