At a country tripoint 3 different countries meet: when is it that there is an official language that you can use no matter which direction you take? A tick means that this is the only official language in all 3 countries. Answers are sorted by language, country A, country B and country C. You have to name the countries and the languages!
It's because there are two tri-points as Liechtenstein is wedged between Switzerland and Austria. Not really a necessary feature, but it's not wrong either.