A grade: { 4, 6, 7, 9, 10, 11, 12, 13, 14, 29, 34, 35, 36, 37, 41, 43, 50, 51, 55, 56, 59, 60 }
B grade: { 1, 2, 3, 15, 16, 17, 19, 20, 21, 22, 30, 31, 32, 33, 38, 39, 40, 44, 47, 54, 61, 62 }
C grade: { 5, 8, 18, 23, 24, 25, 26, 27, 28, 42, 45, 46, 48, 49, 53, 57, 58 }
F grade: { 52 }