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A grade
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{ 1, 2, 3, 9, 16, 18, 19, 20, 24, 25, 27, 28, 31, 32, 33, 34, 35, 36, 37, 46, 48 }
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B grade
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{ 7, 40, 43 }
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C grade
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{ 8, 30 }
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F normal fail
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{ 4, 5, 6, 10, 11, 12, 13, 14, 15, 17, 21, 22, 23, 26, 29, 38, 39, 41, 42, 44, 45, 47, 49, 50 }
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F(-1) timedout fail
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{ }
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F(-2) exception fail
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{ }