IEnumerable<Action> Run(){
    foreach(var action in RunNcFile("Cache/Opt-circle.ptp")) yield return action;
    foreach(var action in RunNcFile("Cache/Opt-drill_slot.ptp")) yield return action;
    foreach(var action in RunNcFile("Cache/Opt-side.ptp")) yield return action;
    foreach(var action in RunNcFile("Cache/Opt-slide.ptp")) yield return action;
    yield return null;
}
return Run();