Leigh Greer, head of market regulation at the Utility Regulator said it would continue to monitor the regulated tariffs to make sure any further falls in costs are passed through to customers.
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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:
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