Greyhound through the card system

[Booksie]

Hi, Just wondered if anyone could help me on this, Few years back when i used to go in my local bookies i used to find a 12 race greyhound meeting and pick a straight forecast i.e 3&1 and back it through the card. I cant remember how to do this now and want to try it again i remember it being something like... Monmore 10p Straight Forecasts x 12 Races Trap 3 & Trap 1 But thats all i can remember apart from if you win say the 1st race and it was a £23.00 f/cast then you get £2.30 onto the next f/cast and if it comes up you get a double and so on. so the more times the 3&1 straight f/cast camp up the better. Does anyone use this or remember how its written etc? My minds gone blank Thanks Booksie :ok