code: public void setRobotFlag(String flag) {
  		String flags = getRobotFlags();
  		if (flags == null) {
  			flags = "";
  		}
  		if (!flags.contains(flag)) {
  			flags = flags + flag;
  		}
  		setRobotFlags(flags);
  	}
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 (don't put multiple flags).