been:
Albania | Andorra | Austria | Belgium | Bulgaria | Cyprus | Czechia | Estonia | Finland | France | Germany | Hungary | Iceland | Ireland | Italy | Kosovo | Latvia | Lithuania | Luxembourg | Malta | Monaco | North Macedonia | Netherlands | Norway | Poland | Romania | San Marino | Slovakia | Spain | Sweden | Switzerland | Turkey | Ukraine | United Kingdom | Vatican City
yet to be:
Belarus | Bosnia and Herzegovina | Croatia | Denmark | Greece | Liechtenstein | Moldova | Montenegro | Portugal | Russia | Serbia | Slovenia
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