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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 remove_all_servers(self):
 """Remove all NTP server entries from the node config Returns: True if the operation succeeds, otherwise False. """

        # 'no ntp' removes all server entries.
        # For command_builder, disable command 'ntp' gives the desired command
        cmd = self.command_builder('ntp', disable=True)
        return self.configure(cmd)