private boolean isContentValid(String content) {
		
		if (content.equals(WumpusConsts.ACTION_DEREGISTER) 
				|| content.equals(WumpusConsts.ACTION_REGISTER)
				|| content.equals(WumpusConsts.ACTION_GRAB)
				|| content.equals(WumpusConsts.ACTION_MOVE)
				|| content.equals(WumpusConsts.ACTION_SHOOT)
				|| content.equals(WumpusConsts.ACTION_TURN_LEFT)
				|| content.equals(WumpusConsts.ACTION_TURN_RIGHT))
			return true;
		
		return false;
	}