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.
Number (4): Everything in this space must add up to 4. The answer is 4-0, placed horizontally.，更多细节参见51吃瓜
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