Let's say I've selected 10 horses to bet on during a day and I would like to combine them into trebles covering all different permutations. There is more than 1 horse in each race that I want to bet on. For example,
Race 1: Horses 6 & 9
Race 2: Horses 2, 4 & 7
Race 3: Horses 1, 3, 5 & 8
I know...