If the Document does not identify any Invariant Sections then there are none.

Preserve all the Invariant Sections of the Document, unaltered in their text and in their titles.

The Document may contain zero Invariant Sections.

To do this, add their titles to the list of Invariant Sections in the Modified Version's license notice.

If you have no Invariant Sections, write "with no Invariant Sections" instead of saying which ones are invariant.

The combined work need only contain one copy of this License, and multiple identical Invariant Sections may be replaced with a single copy.