anchor.diff:  
   
   stop() ->
  -    MaxBrokers = 3,
  -    Brokers = atoms_sequence("broker", "_", 1, MaxBrokers),
  +    Brokers = atoms_sequence("broker", "_", 1, ?MAX_BROKERS),
   
       lists:foreach(fun(Broker) -> Broker ! stop end, Brokers),
       ticker_proc ! stop.
  
positive.code: -module(market).
  -compile(export_all).
  
  
  %%%----------------------------------------------------------------------------
  
negative.code: %%%----------------------------------------------------------------------------
  
  start() ->
      Listings = sets:to_list(sets:from_list(
          for(1, ?MAX_LISTINGS, fun() -> random_symbol() end)
      )),
  
      lists:foreach(
          fun(BrokerName) ->
              register(BrokerName, spawn(market, broker, []))
          end,
          atoms_sequence("broker", "_", 1, ?MAX_BROKERS)
      ),
  
      Interval = 1000,
  