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