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Unit behaviors
Units can be published. Once published, units are available for reuse.
The same publishing rules apply to units as components; units are available for reuse in courses once they are published (see: https://github.com/openedx/frontend-app-authoring/issues/1353)
Units can be tagged
Units can be copied
Units can be pasted
Units can be added to, and removed from, collections
Collections can contain a mix of both components and units
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