Maxima

A grade

{ 16, 17, 18, 20, 21, 22 }

B grade

{ 1, 2, 3, 6, 7, 8, 11, 12, 13, 28, 29, 31, 32 }

C grade

{ 24, 25, 26 }

F normal fail

{ 5, 10 }

F(-1) timedout fail

{ }

F(-2) exception fail

{ }