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Maybe he is swiss, they have some weird quirks. Like they don’t do the ß either I believe. Maybe they don’t use Umlaute. I’d ask them, but I can’t understand them when they talk. That is not even a joke.
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The only orthographic difference is not using ß.
There are more differences but they are in the vocabulary. The Swiss use a lot of French words. Velo instead of Fahrrad, Trottoir instead of Bürgersteig, Cheminée instead of Kamin, Porte-Monnaie instead of Brieftasche, Camion instead of Lastkraftwagen, and so on.
