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A grade: { 5, 10, 11, 12, 13, 14, 18, 19, 20, 22 }
B grade: { 1, 2, 3, 4, 21, 25, 26, 27, 28 }
C grade: { }
F grade: { 6, 7, 8, 9, 15, 16, 17, 23, 24, 29, 30, 31, 32, 33, 34 }
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