How Do I Underline a-S-a in Italian?

If you have a word that's underlining K-A-S-A, shall we say Casa, the S will become a Z because it occurs in between two vowels and so you will come out as Casa. So one from Italian. I'm still not sure if this is taken over completely or if it's in free variation. It sounds more Spanish, Spanish doesn't have that voicing process. But anyway, for our purposes, let's pretend that it's hard and fast. And then you will use our handy feature notation says, so the consonant goes to plus voice in the environment of C and D type of rule.