2.1.5 FriCAS

A grade: { }

B grade: { }

C grade: { 1, 2, 3, 16, 17, 18, 26, 27, 28 }

F grade: { 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 19, 20, 21, 22, 23, 24, 25, 29, 30, 31, 32, 33, 34, 35 }