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A grade: { 1, 2, 3, 4, 5, 9, 12, 15, 16, 17, 18, 19, 22 }
B grade: { 6, 10, 11, 13, 14, 20, 21, 23, 24, 26, 33 }
C grade: { }
F grade: { 7, 8, 25, 27, 28, 29, 30, 31, 32, 34, 35 }
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