Get start URL by "bouncing" back and forth one time.

def bounceStarter(url, nextSearch):
    """Get start URL by "bouncing" back and forth one time."""
    @classmethod
    def _starter(cls):
        """Get bounced start URL."""
        data = cls.getPage(url)
        url1 = cls.fetchUrl(url, data, cls.prevSearch)
        data = cls.getPage(url1)
        return cls.fetchUrl(url1, data, nextSearch)
    return _starter