第三十七条 居民委员会成员接受居民会议或者居民代表会议对其履行职责情况的民主评议。民主评议每年至少进行一次，由居务监督委员会主持，民主评议结果应当及时向居民公布。
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This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.