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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 get_default_commands(self):
 """ Returns the default commands of this application. :rtype: list[cleo.Command] """

        commands = Application.get_default_commands(self)

        self.add(ConstantsCommand())
        self.add(LoaderCommand())
        self.add(PyStratumCommand())
        self.add(WrapperCommand())

        return commands