anchor.diff:  						zone_1.connected_zones = null
   
   			//Then do the same for the other zone.
  -			if(zone_2 in zone_1.connected_zones)
  +			if(zone_1 in zone_2.connected_zones)
   				if(zone_2.connected_zones[zone_1] > 1)
   					zone_2.connected_zones[zone_1]--
   				else
  
positive.code: 						zone_1.closed_connection_zones = null
  
  			//Then do the same for the other zone.
  			if(zone_2 in zone_1.connected_zones)
  				if(zone_2.closed_connection_zones[zone_1] > 1)
  					zone_2.closed_connection_zones[zone_1]--
  				else
  
negative.code: 
  			//If there are more than one connection, decrement the number of connections
  			//Otherwise, remove all connections between the zones.
  			if(zone_2 in zone_1.connected_zones)
  				if(zone_1.closed_connection_zones[zone_2] > 1)
  					zone_1.closed_connection_zones[zone_2]--
  				else
  