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A grade
{ 3, 8, 13, 18, 22, 26 }
B grade
{ 1, 2, 5, 6, 7, 10, 11, 12, 16, 17, 20, 21, 24, 25, 28, 29, 31, 32 }
C grade
{ }
F normal fail
F(-1) timedout fail
F(-2) exception fail
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