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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 sort_model(self, *args, **kwargs):
 """Sort the proxy model :returns: None :rtype: None :raises: None """

        self.proxy.sort(17)  # sort the identifier
        self.proxy.sort(2)  # sort the element
        self.proxy.sort(1)  # sort the elementgrp
        self.proxy.sort(0)