[chryuop]

So basically every kanji ending with a つ is treated as っ according to the first letter of the next word. I had the doubt because my dictionary makes a distinction. For example for 十 it puts the reading じゅう、じっ、じゅっ, while for other words puts only the big つ like 立　（りつ）。

(Thanx for the tip on how to use the IME).