49Thus, it must be pointed out in particular that the coherence of the Schengen acquis and of future developments thereof means that the States which take part in that acquis are not obliged, when they develop it and deepen the closer cooperation which they have been authorised to establish by Article 1 of the Schengen Protocol, to provide for special adaptation measures for the other Member States which have not taken part in the adoption of the measures relating to earlier stages of the acquis’ evolution.
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