Most US coal plants could meet air pollution rules. Trump weakened them anyway

· · 来源:finance资讯

We cannot, and should not, expect users to know this.

"I'm just obsessed with trivia. I used to want to be a chaser on The Chase."

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I learned that for 4-SAT, if clause to variable ratio is more than 10, the generated problems become difficult to solve, and the likelihood of formula to be SAT or UNSAT is close to 50%. So I generated 3 types of formulas:

from bs4 import BeautifulSoup

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