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Start with the full category, then apply the exact boundary: The EIA’s coal, petroleum and natural gas grouping. Refined products such as petrol are not separate categories. You only need one qualifying answer. A longer name is not automatically rarer.
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Shortest accepted input at 65+ points
Natural gasNatural gas · 65 points · 11 characters
Natural gas is a fossil fuel made mainly of methane.
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Natural gas65 points · Shortest accepted spelling: Natural gas
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- Apply the complete question boundary: The EIA’s coal, petroleum and natural gas grouping. Refined products such as petrol are not separate categories.
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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: US Energy Information Administration · Nonrenewable sources ↗
Reference version: 2026-10-21. See our answer policy for how we handle aliases and omissions.