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I was thinking this through as well but if you were Apple estimating this number, wouldn't you have already done the averaging math to arrive at an estimate of 5.5? Seems to me more likely that speed of Greykey brute forcing improved or Apple's estimate was off.

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I get what you mean, but the quote said "all combinations" specifically. I think they'd choose that wording because that's the biggest number they could report truthfully.

Shouldn’t they technically write “all permutations” for the biggest number?

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