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Release Name: 2.3.1

Notes: Release Notes - Sat4j - Version 2.3.1 ** Bug * [SAT-8] - Allow iterating over optimal solutions * [SAT-14] - After a call to expireTimeout(), a solver cannot be relaunched * [SAT-16] - Order of added constraints affects the results of RemiUtils * [SAT-17] - Problem with isSatisfiable(VecInt) * [SAT-18] - ISolver.isSatisfiable(VecInt) is affected by previous call * [SAT-21] - Error in method toString() of OPBStringSolver for negative literals * [SAT-26] - After adding and removing a clause in Xplain, subsequent addition of the clause are ignored * [SAT-27] - PMaxSAT Solving * [SAT-29] - Mus computation does not work when input file contains duplicated contiguous clauses (aka MUS competition bug) * [SAT-32] - Tautological PB constraints with no literals incorrectly considered asempty clauses * [SAT-35] - LexicoHelper constructors are incorrect when explain option is set to true * [SAT-37] - Unit clauses not propagated again when doing multiple calls to the SAT solver * [SAT-40] - Random Walk Decorator disable Objective Function based heuristics ** Improvement * [SAT-11] - Allow creation of ManyCore solver from a list/array of existing solvers instead of their name in a factory * [SAT-12] - Use List instead of IVec in DependencyHelper.getSolution() * [SAT-15] - Allow to reset the DependencyHelper * [SAT-34] - Make sure that all solvers return a unit clause in addClause * [SAT-39] - Add the possibility to create a constraint k among n in IProblem * [SAT-41] - Use a specific data structure to locate efficiently the weight associated to a literal in a counter based constraint * [SAT-42] - Allow Sat4j to use bunzip2 to uncompress on the fly bz2 (and possibly others) compressed files * [SAT-43] - Allow the solver to be aware of the user defined max var id * [SAT-45] - Separate MS and PWMS decorator from the optimization method ** New Feature * [SAT-3] - Allow computation of prime implicants instead of models * [SAT-10] - allow ability to clone a solver * [SAT-31] - Add the ability to add weighted objective function to LexicoHelper * [SAT-44] - add lower bound optimization strategy


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