function getNextLevel($level)
    {
        $levels = $this->getLevels();
        $level_incdeces = $this->getLevelIndeces();
        $level_index = $level_incdeces[$level];
        if (!isset($levels[$level_index + 1])) {
            return false;
        }
        $next_level = $levels[$level_index + 1];
        return $next_level;
    }