2.1.5 FriCAS

A grade: { 1, 2, 3, 6, 7, 8, 9, 10, 11, 12, 15, 16, 17, 18, 19, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48 }

B grade: { 13, 14, 20, 21, 26, 33, 34, 35, 36, 37 }

C grade: { }

F grade: { 4, 5 }