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The real number is very easily found from a common resource found here:
http://www.ama-assn.org/vapp/freida/spcstsc/0,1238,220,00.html
http://www.ama-assn.org/vapp/freida/spcstsc/0,1238,220,00.html

.. but agree .. palpation needs to be with only one !!!