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There probably COULD be duplicates, but there are probably so many parameters that the odds are highly against it.
Suppose there are 64 noses, 64 mouths, 64 foreheads, 64 cheeks, etc. That's a lot of permutations and the odds of getting two people who look exactly the same are infinitely small.
I'm assuming, of course, that there are more than 64 of each type - there are probably a multitude of variations for each parameter.
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