See this meta question, where two questions covering similar topics got merged:
- What Is The Difference, If Any, Between "Permanent", and "Until Dispelled"?, and
- Can a permanent teleportation circle be dispelled?
However, the merge was in error, as the Permanent vs Until Dispelled question does not apply to the Teleportation Circle question, since the duration of Teleportation Circle is not Permanent.
Is it possible to un-merge these questions?