Has anyone actually made a legitimate alphabet key thingy?

[Jorge_Stolfi]

"s" too represents two different sounds ([s,z])

  But isn't there an algorithm that tells which is which, at least most of the time?  Like, single "s" sounds like [z] between vowels, like [ʃ] when combined with "ci" or "ce", like [s] otherwise?

and so does "z" ([ts,dz])

Isn't it [ts] only when doubled?  (Did I tell you about the import of "pizza" into Portuguese?)

As  I told you before, the language we spoke at home was Venetian, and I learned Italian mostly by reading. So for most of my life I had the wrong stress on  several words, like "ubriaco" and "eravamo"...

All the best, --stolfi