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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 is_pyclustering_instance(model):
 """ Checks if the clustering.rst algorithm belongs to pyclustering :param model: the clustering.rst algorithm model :return: the truth value (Boolean) """

        return any(isinstance(model, i) for i in [xmeans, clarans, rock, optics])