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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:
Раскрыты подробности похищения ребенка в Смоленске09:27
For almost six decades Hornby has watched Scalextric drive revenues for its hobby business but on Friday the company said it had decided to sell the famous slot car racing brand for £20m to a little-known buyer.