A grade: { 1, 3, 5, 8, 10, 12, 15, 17, 19, 22, 37, 38, 43, 45, 46, 47, 48, 61, 62, 63, 64, 66, 68, 88, 89, 90, 91, 92, 96, 97 }
B grade: { 7, 14, 21, 35, 36, 39, 95 }
C grade: { 2, 4, 9, 11, 16, 18, 49, 50, 51, 55, 56, 57, 85, 86, 87 }
F grade: { 6, 13, 20, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 40, 41, 42, 44, 52, 53, 54, 58, 59, 60, 65, 67, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 93, 94, 98, 99 }