🇩🇪 🇧🇪 Aachen Altenburg
🇩🇪 🇧🇪 Aachen Eupen
🇩🇪 🇳🇱 Aachen Vaals
🇨🇭 🇫🇷 Basel Saint-Louis
🇨🇭 🇩🇪 Basel Weil am Rhein
🇫🇷 🇧🇪 Lille Herseaux
🇺🇸 🇨🇦 Niagara Falls
🇩🇪 🇫🇷 Saarbrücken Sarreguemines
🇫🇷 🇩🇪 Strasbourg Kehl

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🇺🇸 🇲🇽 El Paso Juárez
🇨🇭 🇫🇷 Geneva Annemasse
🇵🇱 🇩🇪 Katowice German Upper Silesia
🇸🇬 🇲🇾 Singapore Johor Bahru 🚧