Thank you for the tip. I have already forwarded it to some friends. Indeed, this tip seems so obvious in hindsight, but it wasn't obvious really. I never thought of it. Along the same lines, there's usually some annoying little kid in the group who's walking around taking thousands of pics. Actually, it's more like cute, but sometimes it's annoying when they're candid shots. Anyway, I will be encouraging the kid from now on to make sure to get a bunch of pics of everybody in the group.
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If you're reading this, it's too late.