Wir haben einen Besitzstand, den Schengen-Besitzstand, der, wie Herr Pirker ganz zu Recht hervorgehoben hat, in den einzelnen Staaten sehr unterschiedlich umgesetzt wird.

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Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
We have the Schengen acquis, that, as Mr Pirker quite rightly underlined, is implemented very differently in the various States.