given day that has done nothing but drain liquidity from each of those holes and left them really pottle and now we have dark pools and that's maybe ten four percent of total volume what is that how is that impacting your business the near stack is change the original dark or we would post the full. half three quarters in a marketplace in those participants and then he's a member for to come to the floor and find out where they can trade a block of stock that's not electronically pain and that's where those high frequency traders come in they came in those dark pools to sense where their supply and demand and trade against it but one of the reasons they've gone dark and try and remain dark is to avoid being detected by the marketplace and status excessive model and you think there is still a role for humans to capture back maybe what was lost a few years ago with electronic trading and so i think my analogy is this where you get out you could probably fly in a plane for five dollars from here to the los angeles if there were no pilots but if you need a pilot when you take off you need a