Hi tomorchid,

to GameBoomers. I removed your duplicate thread with the same question.
From the companion guide:
If you stand in the antechamber with the castle exit directly behind you, then Li is the rune to your left and Ri is the rune to your right. Take a step forward and the rune to your left is Lii and the rune to the right is Rii. Take another step forward and they are Liii and Riii.
Hope that helps.