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