调试技巧：加打印语句观察每轮变化
await blocking.writer.write(chunk4); // waits until consumer reads，详情可参考heLLoword翻译官方下载
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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: