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These plugins only do one thing: identify cruft. See the 'get_cruft'
method for details.
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c �n � | j � D ] }|j � � | j � y)zFFind cruft and clean it up.
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c �, � t | j � �)as Find some cruft in the system.
This method MUST return an iterator (see 'yield' statement).
This interface design allows cruft to be collected piecemeal,
which makes it easier to show progress in the user interface.
The base class default implementation of this raises an
exception. Subclasses MUST override this method.
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