Even assuming consistent grading, the difference between a 7 and an 8 can be nothing but a microscopic bit of corner wear that you could only see under a loupe. And the assumption of course is far from true, in many cases the grade is arbitrary.
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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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