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As a former teacher, I was glad to have the option of pluses and minuses - there were times when work was just a shade below A-level work but really quite good, and deserving of better than a B, and having the A- option kept me from having to be a hardass and dropping the paper a grade. Really, I don't know why we assign point values to letters instead of just working on a straight numerical scale. If you get a 93, it's a 93, not some letter grade that could represent anything between an 89 and a 94.
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"If ten million people believe a foolish thing, it is still a foolish thing."
- Anatole France
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