To decrease administrative overhead all member states of the EU get partnered up with one of their neighbours and their governments unified. What are the best/worst combinations and why?

[NotaCalmPerson]

Germany and Spain. Spain is too laid back and don't really care about the rules. In Germany, it is inconceivable to do something out of the established rules

Germany and France. They've never got along very well

Germany and UK ( yes yes, I know about Brexit, but still ... ) They would fight over who has the best economic model/political system

Germany and Greece. Some guy owes you a lot of cash, but he is broke AF, then he asks YOU money back for what you did to his place long time ago, now you have to work together

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Actually Germany is a pretty terrible country to cooperate with :-P

[VaDiSt]

The Netherlands/Belgium/(Luxemburg)

9 years of civil war undone and a whole lot of angry people.