Yes most of the poms (or ex-poms like me) will know that this type of mixed doubles/trebles/ 4'somes/5 somes/6'somes/7 somes and even 8 'somes is NORMAL betting shop betting in the UK. where you are able to mix ANY betting event (not necessarily on the same day) with unit stakes as low as 1pence (about 2.5 cents)
4 horses or (events)full perm is 11 bets, and the bet is known as a "Yankee"
5 horses or events full perm is 26 bets, and known as a "Canadian"
6 horses or events full perm is 57 bets and known as a "Heinz"
7 horses or events full perm is 120 bets and known as a "Super Heinz"
8 horses or events full perm is 247 bets and known as a "Golaiath"

I wondered how long it would take OZ to catch up, these bets are VERY popular in the UK as it allows the backer to cover multiple selections for a modest sum, with the faint hope of collecting a fortune. A rough example is a 50c Heinz reaps $1,000,000 + with 6x 9-1 winners. cost= $28.50c

One of my most spectacular wins a s a young bloke was with a 2Pence Canadian, 5 winners 8-1, 6-1, 2x9-2, and a 4-1, cost of bet was 52 pence (about a Dollar) the return was 820 Pounds, and believe me that was "REAL CASH" 33 years ago. The full cover with 5 horses is 10x doubles, 10x trebles, 5 x 4'horse accumalators, and one 5 horse accumalator.