Timer (frames), uniform random:
class A: 32, 64, 92, 128
class B: 32, 64, 128, 192
class C: 32, 48, 64, 80

Direction: each spinner has 4 values, pick one uniformly at random
- list of possible directions can have duplicate entries
- new direction can be same as old direction

so we are guaranteed 32 frames, is it enough...