Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K - Z K K
I have PM's proof if you don't believe it.
