As Mike said, I don't think it's possible either. There are just too many bad things that can happen to cards at the low end such as paper loss, pin holes, rips, and so forth. I think for writing on cards, SGC automatically downgrades to Fair in most cases. If you want to try to equate how much a card is worth at these grades, a lot will be really dependent on eye appeal as for example, paper loss or writing on the back is usually not the same as on the front.
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