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Christoph Egger authored
The satsolver is reatined and only updated with new clauses for every state that is generated out of a core. Once the core becomes Open (as opposed to expandable), the solver is no longer needed. This patch makes the solver a `Solver option` and gets it deallocated once no longer needed and resets the hashtable (makes it empty and zero size) to save memory. This saves about 60% memory usage on some extreme cases (e.g. exp_unsat from the CTL Benchmark set)
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