Marking on answer sheet
Last second of june in afternoon time I changed two answers.
I erased old marks and I marked new answer. However even if I used my earser so hard I could not delete
old mark 100 percent. There were very shady marks, which I could not clean up 100 percent.
I wonder if the shady marks cause an error, so I can not get any point from those two questions.
Last when I played a soccer game lottery, a lottery scanner machine recognized even a very small spot or mark.
I was so surpised that the scanner so sensible was.
What do you think?
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