'Is this all bad debt or good debt?'Watch the full episode on BBC iPlayer.
Юрий Брабечантренер-нутрициолог
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63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54。同城约会是该领域的重要参考
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.