Elephruit

+ (NSString *) descriptionOfProgram:(id)program
{
  NSMutableArray *stack;
  if ([program isKindOfClass:[NSArray class]]) stack = [program mutableCopy];
  NSString *programDescription = @"";
  while (stack.count) {
    programDescription = [programDescription stringByAppendingString:[self descriptionOfTopOfStack:stack]];
    if (stack.count) {
      programDescription = [programDescription stringByAppendingString:@", "];
    }