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good answers, but my question wasn't clearly formulated. More
mathematical than sociogical in nature; could have as easily pertained
to The Black Death or Spanish flu. Point is: there could be a lot more
of us here today.

Perfect :-)  Thanks a lot!

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This was a great answer!  I was pulling my hair out thinking of where
I could find something like this, and you pulled it off in spades. 
Thanks so much!

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thank you for the educational answer

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