A grade: { 5, 14, 18, 21, 24, 25, 29, 30, 47, 48, 59 }
B grade: { 1, 2, 3, 4, 6, 7, 8, 9, 10, 15, 16, 17, 19, 20, 22, 23, 26, 27, 28, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64 }
F grade: { }