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from canonical.launchpad import _
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from canonical.launchpad.webapp import Navigation
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from canonical.launchpad.webapp.publisher import canonical_url
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from lp.app.browser.tales import ObjectFormatterAPI
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from lp.code.interfaces.diff import IPreviewDiff
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from lp.services.browser_helpers import get_plural_text
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class PreviewDiffNavigation(Navigation, FileNavigationMixin):