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from zope.interface import implementer, implements, implementsOnly
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from zope.intid.interfaces import IIntIds, IIntIdAddedEvent, IIntIdRemovedEvent
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from zope.component import adapter, queryUtility, getUtility
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from zope.container import btree
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from zope.container.contained import Contained
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from zope.lifecycleevent import IObjectModifiedEvent