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Identical twins are not clones for a number of reasons.

I agree, but that's the only 1 in 400 number I could come up with.

Wow, the mother has to roll a natural 20 twice in a row! Oh, I guess racial bonuses apply: https://en.wikipedia.org/wiki/Twin#Incidence

> The likelihood of a single fertilization resulting in monozygotic twins is uniformly distributed in all populations around the world.