code: def validate_proxy_args(cls, *args):
          
          supplied_proxies = Counter((not arg for arg in (*args,))).get(False)
          if not supplied_proxies:
              return
          elif supplied_proxies > 1:
              raise RaccoonException("Must specify only one of the following:\n"
                                     "--tor-routing, --proxy-list, --proxy")
docs: No more than 1 of the following can be specified: tor_routing, proxy, proxy_list