Constraint programming is used to solve problems that have many variables and that have many possible solutions. An interactive constraint solver application provides additional information to a user if a conflict arises between two choice-constraints so that the additional information can be used to resolve the conflict according to a model-constraint set up by an application developer. The additional information identifies a priority group, or queue, to which the constraint was added. Depending on the particulars included in the additional information, and the model-constraints, the conflict is resolved by the interactive constraint solver application.
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