Thanks Percentum, yes I understand now, being an aa-pom I am familiar with combination betting, it was the 31 bets (for 5) that threw me, but now I understand 26 bets in the combo + 5 singles, good stuff, though I didn't realise that AIS were accepting these now.

Worth considering that you can also allot a higher stake for the doubles, and lesser on the Trebles & 4'somes, (i.e. less likely to succeed.) but I would always leave a full unit for the 5 horse accumalator as this can be the lifechanger!