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Start with the full category, then apply the exact boundary: One of the six countries that signed the Treaty of Rome in 1957. You only need one qualifying answer. A longer name is not automatically rarer.
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LuxembourgLuxembourg · 84 points · 10 characters
Luxembourg is one of the 27 European Union member states in the September 2026 reference set.
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Luxembourg84 points · Shortest accepted spelling: Luxembourg
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- EU membership, founding EEC membership and a specific accession year are different sets. Geographic location in Europe alone is not enough.
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Each entry belongs to the bounded set defined by the prompt. The named source supports the underlying facts; our editorial scoring is a separate layer.
Source: European Union · Member countries ↗
Reference version: 2026-09-13. See our answer policy for how we handle aliases and omissions.