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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 is one of the 27 European Union member states in the September 2026 reference set.
84This pick belongs to the selected question’s answer set. Points are a fixed knowledge rating.
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LuxembourgLuxembourg is one of the 27 European Union member states in the September 2026 reference set.
84BelgiumBelgium is one of the 27 European Union member states in the September 2026 reference set.
38NetherlandsNetherlands is one of the 27 European Union member states in the September 2026 reference set.Aliases: Holland · The Netherlands
32ItalyItaly is one of the 27 European Union member states in the September 2026 reference set.
18GermanyGermany is one of the 27 European Union member states in the September 2026 reference set.
15FranceFrance is one of the 27 European Union member states in the September 2026 reference set.
12Why these answers qualify
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.