今年一月，被外界普遍視為習近平最親密軍方盟友的張又俠上將遭到免職。他被指控「嚴重違紀違法」，這通常是當局用來指涉貪腐的委婉說法。
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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.