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