I'm going to back 8 horses in each of 5 races.

There are 10 Doubles
" " 10 Trebles
" " 5 Fourfolds
" " 1 Accumlator

AB
AC
AD
AE
BC
BD
BE
CD
CE
DE

ABC
ABD
ABE
ACD
ACE
ADE
BCD
BCE
BDE
CDE

ABCD
ABCE
ABDE
ACDE
BCDE

ABCDE

Are those combinations correct?

Benny