Tsi is a 3 letter English word.
You can make 15 anagrams from letters in TSI (ist).
If the syllables preceding the suffix -tsi also contain -tsi-ti.
So the well-educated tsi visitors follow a rule: “Within these walls, we never talk politics.”
Other proper names, especially those of mountains and the villages built on them, take the suffix -tu (upon) instead of -tsi.