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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.
The committee which advises the government on vaccinations - the JCVI - recommended that all children be given the MMRV in November 2023.。同城约会是该领域的重要参考