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.
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2-phase A* already uses many heuristics which don't always create an optimal route and still 5-10x slower.，这一点在heLLoword翻译官方下载中也有详细论述
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