2.1.4 Maxima

A grade: { 1, 3, 5, 7, 8, 10, 11, 12, 19, 20, 22, 33, 34 }

B grade: { 23 }

C grade: { 4 }

F grade: { 2, 6, 9, 13, 14, 15, 16, 17, 18, 21, 24, 25, 26, 27, 28, 29, 30, 31, 32, 35 }