* 时间复杂度：O(n)，空间复杂度：O(n)
A war trumpet was used by Celtic tribes across Europe to intimidate their enemies and to inspire and direct warriors during battle.
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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.
At least 15 people have been killed and others injured after a Bolivian air force cargo plane crashed in the western city of El Alto, the country's authorities say.
Мерц резко сменил риторику во время встречи в Китае09:25