result = mBotsRunnerListeners.remove(listener);
HashSet clone = (HashSet)mBotsRunnerListeners.clone(); result = clone.remove(listener); mBotsRunnerListeners = clone;
	public boolean removeBotsRunnerListener(BotsRunnerListener listener)	{		if (null == listener)	throw new IllegalArgumentException("listener can't be null.");        boolean result = false;				synchronized (mBotsRunnerListenersMonitor)		{			result = mBotsRunnerListeners.remove(listener);		}				assert false == mBotsRunnerListeners.contains(listener);				return result;	}