2.1.3 Maple

A grade: { 3, 4 }

B grade: { 1, 2, 5, 6, 7, 8, 16, 17, 18, 25, 26, 27 }

C grade: { }

F grade: { 9, 10, 11, 12, 13, 14, 15, 19, 20, 21, 22, 23, 24 }