Using "Not" and "And" within if/countif

[aramg83]

Hi,

I have 4 cells of data, v4, w4, x4, y4. I want to write a formula with the following logic:

If v4=x4 AND (v4 <> w4 OR v4 <> y4), return "tError"
Else return "OK"

What is the correct syntax?

Thanks,

Aram