2.1.4 Maxima

A grade: { 4, 5, 6, 7, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 40, 41, 44, 45, 46, 50, 51, 55, 56, 57, 58, 60, 61 }

B grade: { 1, 2, 3, 8, 12, 13, 37, 38, 42, 43, 47, 48, 49, 52, 53 }

C grade: { }

F grade: { 34, 35, 36, 39, 54, 59 }