def isNullAllowed(self):
        return self._onlyNullAllowed
Return all vertices in the graph, including duplicate
dataset/ETHPy150Open rwl/muntjac/muntjac/data/validators/null_validator.py/NullValidator.isNullAllowed--crossover with--dataset/ETHPy150Open christabor/MoAL/MOAL/data_structures/graphs/graphs.py/Graph.all_vertices