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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def getSolution(self):
 """ Find and return a solution to the problem Example: True {'a': 42} @return: Solution for the problem @rtype: dictionary mapping variables to values """

        domains, constraints, vconstraints = self._getArgs()
        if not domains:
            return None
        return self._solver.getSolution(domains, constraints, vconstraints)