Can someone help me for a one code? А system for fully combining football with odds.

Question

system for fully combining football with odds

Answer 1

for example I want to give the following: match1 = odds2, match2 = odds2.5, match3 = odds2.1, match4 = odds2.6
match1*match2=?
match1*match3=?
match1*match4=?
match2*match3=?
e.t.c.

Answer 2

For full combinations I have to multiply all the odds by myself