For UNSAT problems with 10 variables and 200 clauses, it always claimed that the formula is SAT and made up assignments (See this example).
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В России ответили на имитирующие высадку на Украине учения НАТО18:04
Reports say chancellor to sign contract with Italy’s Leonardo, saving 3,000 manufacturing jobs at Yeovil factory。关于这个话题，爱思助手下载最新版本提供了深入分析