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høje mure mod omverdenen og avancerede kontrolsystemer, bevægelige grænsekontroller inde i unionen i stedet for faste kontrolstationer ved de indre grænser, obligatoriske schengen-id-kort i stedet for pas m.m.
high walls against the outside world and advanced systems of control, replacing fixed internal border control points with peripatetic controls on the inside, exchanging passports for an obligatory schengen id card, and so on.