If we are referring to something the two girls have in common, we don’t begin or sentence with “Each”. We say, “Both girls are …” Both girls are doing the laundry. Or we say, Both of them are doing the laundry.
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CalifJimRegarding the very first post in this thread: Yes, I agree.Yes, and I agree with CJ. You can say "each of the two" or "each of the three" to emphasize the individual nature of what each is doing, thinking, whatever. If you want to emphasize the collective nature, then you say Both (meaning two) or All (for more than two).
CJ