Combining Set Analysis Operators

[mjamesking]

Hi,

I know that to create a union between two sets you use syntax such as

<set1> + <set2>

and to create the intersection of twos sets you use

<set1> * <set2>

But is there any was of combining these operators?

For instance I would like to create the intersection of sets, each of which is the union of two sets itself

e.g.

(<set1> + <set2>) * (<set3> + <set4>)

Doesn't like the parenthesis though

Any ideas?

Matt

[mjamesking]

Thanks everyone for your help, I was close, but the combination of the $ and the ( was making qllikview think I was referencing a variable so I didn't pursue this route, both sunindia and swuehl approaches work perfectly