2.1.5 FriCAS

A grade: { 1, 2, 4, 5, 6, 10, 11, 12, 16, 17, 18, 19, 22, 23, 24 }

B grade: { 3, 7, 8, 9, 13, 14, 15, 20, 21 }

C grade: { }

F grade: { }