Homo . . . phones

So, this morning I was discussing this with my wi . . ., er, I mean, partner (I forget, we're in England). Her being more the gramattical expert and wordsmith, I asked, "other than 2 (two, too, to), how many triple homophones exist??"

Hint: I don't know the answer (although I THINK it is None).

Rules: No foreign words- e.g. see, sea, si

I await your insight