In my opinion, a 10 is often an arbitrary grade. I would guess that if you took 50 well centered 9s and 50 10s of the same card and cracked them out and resubmitted, the results would be dramatically different, if not random.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
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