code: public void setRobotFlag(char flag) {
  		String flags = getRobotFlags();
  		if (flags == null) {
  			setRobotFlags(Character.toString(flag));
  		} else {
  			if (flags.indexOf(flag) < 0) {
  				setRobotFlags(flags + flag);
  			}
  		}
  	}
docs: Add a flag to {@code robotflags} field.
  If {@code flag} is already set, this is a no-op.
  @param flag a flag to add