2.1.7 Giac

A grade: { 11, 16, 17, 18, 19, 24, 25, 26, 29, 30, 31, 32 }

B grade: { 21, 23, 33 }

C grade: { }

F grade: { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 20, 22, 27, 28 }