please explain, page-41

sally-watch closely the cos you will see a pattern of play,
i used to track bots they represent a code after a while i could nominate which fund was in play on the stock,anz is difficult to daytrade.

i do have a theory on how to play them however you need a mass
of technology and deep pockets for the trade,you can see all the potential dt,s in the course of sales and a vg. proprietary system will reduce risk on the spread,so its carefully buy and hold or high risk dt, pain the us market is unhappy today.so while i look it probably will not be a bank
to dt.

ultimately a large prop system will make gains on a smaller spread and they control the spread rolling through the day