I was wondering the same thing myself. I'm guessing they tested it and found that it hit every coordinate at least once and said "good enough". Meaning, I don't think it's guaranteed, they just picked one that did.
The interesting thing is that you're guaranteed to always have a different number because otherwise the cycle would restart. So you just need to find a sequence that's long enough.
The interesting thing is that you're guaranteed to always have a different number because otherwise the cycle would restart. So you just need to find a sequence that's long enough.