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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 set_source_interface(self, name):
 """Assign the NTP source on the node Args: name (string):
 The interface port that specifies the NTP source. Returns: True if the operation succeeds, otherwise False. """

        cmd = self.command_builder('ntp source', value=name)
        return self.configure(cmd)