Jim Lovell, Apollo 13 astronaut, dies aged 97

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年度征文|2025 年育儿手记:从家到幼儿园

SAT (short for "satisfiability") is a logic problem that given a boolean formula, it asks whether the boolean formula has an assignment that makes the problem true. An example boolean formula is:

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ballin is available open-sourced on GitHub, and the prompts used to build it are here.

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