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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 free(self):
 """Free the memory referred to by the file-like, any subsequent operations on this file-like or slices of it will fail. """

        # Free the memory
        self._machine_controller.sdram_free(self._start_address,
                                            self._x, self._y)

        # Mark as freed
        self._freed = True