2.1.2 Mathematica

A grade: { 1, 3, 4, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 29, 30, 31, 32, 33, 34, 36, 37, 38, 40, 41, 46, 47, 50, 51, 53, 54, 55, 59, 60, 62 }

B grade: { 2, 39, 45 }

C grade: { 5, 6, 7, 12, 18, 25, 26, 27, 28, 35, 42, 43, 44, 49, 56, 57, 58, 61 }

F grade: { 48, 52 }