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A grade
{ 9, 10, 11, 12 }
B grade
{ }
C grade
F normal fail
{ 6, 7, 8, 13, 14, 15, 16, 17, 18, 19, 20 }
F(-1) timedout fail
F(-2) exception fail
{ 1, 2, 3, 4, 5 }
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