What is the name of the union of cities that Trier is a part of?
TriPole
DuoPole
QuattroPole
PentaPole
Answer
Trier is a part of the QuattroPole union of cities. This union also includes Luxembourg, Metz, and Saarbrücken. It is central to the greater region encompassing Saar-Lor-Lux, Rhineland-Palatinate, and Wallonia.
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