Suppose I plan to learn the teleportation circle spell, or another spell that can use teleportation circles, some time in the future, but I don't currently know any such spell (or have one in my spellbook, if I'm a wizard). Can I start collecting known sigil sequences now and then use them once I learn the spell, or is knowledge of the spell a prerequisite for comprehending the sigil sequences?
For a specific example, would the following sequence of events be possible?
- Visit a town and learn the sigil sequence for a teleportation circle there.
- Leave the town and go adventuring.
- Learn the teleportation circle spell during the course of my adventure (having not previously known any teleportation spells)
- Use the spell to return to the teleportation circle in the town whose sigil sequence I had previously learned?