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.
YouTube's chief executive Neal Mohan said: "By reconstructing the original 2005 watchpage, we aren't just showing a video; we are inviting the public to step back in time to the beginning of a global, cultural phenomenon."
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Sirens have been heard in Israel 8:13am。夫子对此有专业解读
港大阮穎嫻博士認為，香港跟中國大陸的市場規模始終相差巨大。餐飲聯業協會楊振年主席則認同香港才在「追落後」。。业内人士推荐同城约会作为进阶阅读