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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 _removecleaner(self, cleaner):
 """ Remove the cleaner from the list if it already exists. Returns True if the cleaner was removed. """

        oldlen = len(self._old_cleaners)
        self._old_cleaners = [
            oldc for oldc in self._old_cleaners
            if not oldc.issame(cleaner)
        ]
        return len(self._old_cleaners) != oldlen