Hi coolguy01 1) Americans do not need visas / a visa for traveling to Europe as tourists. Since Europe consists of the EU and other non-EU countries, visas (plural) would mean all of these countries and zones. But since no visa is required at all, the singular form conveys the same meaning.
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coolguy012) I am trying to convey that a person needs a separate access card for each room in the building, but there might not be a need to enter more than one room.How about this?
coolguy01