Fricas

A grade

{ 1, 2, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 17, 19 }

B grade

{ 3, 7, 16, 18, 20 }

C grade

{ }

F normal fail

{ }

F(-1) timedout fail

{ 21 }

F(-2) exception fail

{ }