A grade: { 2, 9, 10, 11, 12, 19, 43, 44, 45, 47, 48, 49, 50, 51, 54, 55, 76, 77, 78, 79, 80, 82, 83, 84, 85 }
B grade: { 1, 4, 5, 6, 7, 8, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 46, 52, 53, 58, 59, 63, 74 }
C grade: { 3, 56, 57, 60, 61, 62, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 75, 81 }
F grade: { }